I just hope his back gets better in time for the GP

Poor Sota looks so sad again in the IG video, at least to my eyes. No wonder, he must be worrying about his Kinoshita participation. But it's very early in September, and a very difficult field. I just hope he gets another CS/B event chance by JSF, and WDs from Kinoshita, for his own health. Nothing short of a miracle would need to happen for him to be fully healed + fully trained + level-headed enough against the top Russians and top Japanese. IMO, there's nothing to be gained by competing so soon after an injury when it's likely he'd finish below even his last year's placement.
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Here's a recent Sota interview, in which he speaks about his mom's passing for the first time. It's quite moving...

... and geoblocked. I was fortunate enough to get an opportunity to read the whole thing, but this is what's visible from the free version:
フィギュアスケート男子で昨季の4大陸選手権銅メダルの山本草太選手(中京大)が毎日新聞のインタビューに応じた。 今年2月に母・圭余子(かよこ)さんが急逝。現役続行の決断を後押ししてくれた亡き母への思いを取材で初めて口にし、競技と向き合う現在の心境や今季へ懸ける決意を語った。【倉沢仁志】
mainichi.jp
Sota Yamamoto: "I'm saying this for the first time," Saying goodbye to my mother, and my firm resolve
Sota Yamamoto (Chukyo University), who won the bronze medal in men's figure skating at last season's Four Continents Championships, gave an interview to the Mainichi Shimbun.
In February of this year, his mother, Kayoko, passed away unexpectedly. In this interview, he spoke for the first time about his feelings for his late mother, who encouraged him to continue his career, and he also spoke about his current feelings as he faces the sport and his determination for this season.
The thank-you message he sent
For the past few seasons, Yamamoto has been struggling, experiencing disappointment and suffering as he has pursued results.
"My dream finally turned into a goal," he said, referring to her first Olympic appearance last season, when he was plagued by a back injury from the start. He finished fifth in the All Japan Championships, which served as the final selection event, and his biggest goal was not achieved.
At 26 years old, with his future uncertain, Yamamoto has chosen to continue competing this season.
"I started skating because I love it. I want to have a competitive career where I can continue to love my own skating. Of course, I think the training will get harder in order to get results, but I want to approach this sport from a different angle this season, while having the composure to even enjoy that."
After saying that, he continued, "I hope to be able to turn all kinds of experiences into the joy of skating."
Among his many experiences was the farewell to his beloved mother, with whom he had walked hand in hand since childhood.
"This is the first time I've said this, but..."
Yamamoto began by saying that, and then continued speaking...
[the rest is paid]
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It says that his mom passed away very shortly after Kokutai

The thank-you message in the headline refers to Sota's mom congratulating him after 4CC, and Sota thanking her for all she'd done for him in turn. I was really touched by a part in which Sota mentions he talks to his mom's photo sometimes. I do think he's chosen the best way possible of dealing with such a tragedy. His mom would be so proud of him
BTW, user feedback wanted: Sota posted on Twitter that this Thursday would have been his mom's birthday. I posted a happy birthday wish in the reply section, though it's in-memoriam, but I'm doubtful whether it was appropriate or if it might come across as insensitive... I didn't want to pass Sota's post by simply clicking a reaction emoticon, yet felt that maybe sending commiseration and condolences could add to Sota's already profound sadness, so I wanted to opt for something to show Mrs. Yamamoto is still with him in some capacity... but not sure at the moment if I picked a tactful way to put it across or not. Thoughts?