Shoma only showed the one medal as far as I know? (Note that I am no longer on Twitter for various reasons.)
Yes,
Shoma's account only posted 1 medal (the silver from Olys 2018). The joke is, he tried using it to prove he's the real Shoma Uno without revealing his identity, because there's a Twitter user wondering if his account is real and not an impersonation. This is obviously for fun and is pretty useless, because Shoma has posted links to his Youtube account and photos of himself on Twitter.
身バレ防止のためプライバシーに関する詳細はお伝えすることができませんがこちらで身分を証明することは可能でしょうか?ご検討の方よろしくお願いします
"To prevent personal identification, I cannot share details related to my privacy, but would it be possible to verify my identity through this method? I appreciate your consideration."
Shoma got teased for it by Nao Kodaira, who said if it's
just an Olympic silver medal from 2018, she also has it (she has 1 gold and 1 silver from 2018 Olympics for speed skating)... she told Shoma to at least take photos of the
back of the medal, which would have the athletic discipline (men's figure skating) engraved on it.
うちにも似たような

がありますが、裏面ならより証明できるかと

"I have a similar
too, but I think the back side might serve as better proof
"
And then the official Olympic / IOC Twitter account in Japanese quoted Shoma saying
but Shoma Uno has 3 Olympic medals... which then caused another round of laughter because it was like the Olympics Twitter itself doubted Shoma's Twitter authenticity because he posted 1 medal instead of 3 medals. What a problem, right?
宇野昌磨さんは3つの #オリンピック メダルを持っています

"Shoma Uno has three Olympic medals
"
The guy Shoma posted on his Twitter, Aaron Wolf, has 3 Olympic medals in judo, 1 gold from 2020 and 2 silvers from 2020 and 2024. He joined the fun by quoting Olympics with a photo his own medals (from the SUMMER Olympics) saying that...
I'm sorry... it seems it is actually me who is Shoma Uno (because he has 3 medals). Shoma was on his replies going,
hasn't Shoma Uno grown bigger than the last time I saw him???? because obviously, Aaron is a lot bigger than Shoma and has joined pro wrestling after his retirement from judo, and people were cackling because now it seems Shoma Uno's entered pro wrestling
皆様申し訳ありません。僕が宇野昌磨さんだったみたいです。
"I’m terribly sorry, everyone. It seems that I was Shoma Uno."
宇野昌磨さん見ない間に少し大きくなられましたか?
"Has Shoma Uno grown a bit since the last time we saw him?"
Japanese Twitter found this whole banter between Olympic medalists AND the Olympic itself
very funny for some reason, because the engagement numbers for all of them are insane, Shoma adds more than 20,000 followers for tweeting that right before a
very busy weekend of skating in Japan. My favorite is just someone saying "the ice rink is overgrown with grass" because "grass" in Japanese is slang for laughter
Also
Shoma's latest Tweet, which is a screenshot of Aaron Wolf's youtube video from his own channel (meaning, Shoma's checked out his channel) is a riff from Demon Slayer, saying would you like to become an Uno too? And now people are like, well now if you have 3 Olympic medals, you can be Shoma Uno!!!!!
『お前も宇野にならないか?』
"How about becoming Uno yourself?"
---------
Sorry for laying it down because it's sending me just how Shoma is like... very good at Twitter humor (Twitter, not X) and also somehow manages to involve so many unrelated people hrhrhrhr. I'm not even wondering if he has previously used Twitter in the past (because at this point he OBVIOUSLY has). I'm wondering if his account was one of those big accounts that would just post clickbait things
Also
Itsuki's post on Instagram has this in the captions, which is a joke (Itsuki follows Shoma on Twitter), and also as you can see the background of the medals are the same in their photos:
【なりすましアカウントでの画像使用は辞めて下さいね】
"Please stop using my images on impersonation accounts."