Poor posture is means the skater’s weight is not “centered” over the skate. If the head or torso is pitched forward, then weight transfers from the back of the skate to the front, which is less stable. You should be able to draw a straight line from the skater’s head to the centre of the blade that traverses the body. Google figure skating + “posture” and you can find items like this:
a band for posture training. As I said, good posture means the skater’s weight is properly balanced, and it’s aesthetically more pleasing; looking down at the ice or letting the body pitch forward are considered bad habits that are often seen in new skaters.
Alina has relatively poor posture during crossovers, which detracts from the performance — it’s hard to project and perform outward if the head is tilted downward — and is noticeable due to interrupting Alina’s otherwise elegant lines. (She has the best Rippons of anyone in ladies, in my opinion. I’m often not a fan of arm variations but I could watch Alina’s Rippons all day.) It also suggests weaker basic skating skills, due to the fact that Alina no longer appears to have her weight over the centre of the blade. It’s something I hope and expect she will improve upon, but it’s a legitimate critique. It is a noticeable issue that detracts from the performance and suggests lesser control over the blade than is expected.
I quite enjoy Alina, but she lacks the soft knee bend and easy flow over the ice that skaters who have impressive skating skills have attained. (She’s also younger, which is why I don’t consider it as vital an issue; I assume she will improve with time.) Her skating skills are not weak by any means, and the relative weakness there doesn’t detract from her performance... except for when her posture worsens. Again, I assume time and experience will do their work. But it is a real critique and not a subjective bias — it’s not a subjective one like preferring one skater’s music or artistry over another. It is an observable, noticeable issue.
There are moments in her DQ performances in which her poor posture lessens the performance for me, given how ballerina-esque she is throughout the majority of it.
Did you see your other coworkers go to work with two differently coloured shows the next days? Then you would have had the proof: They didn‘t see it as a mistake at all, they thought you were just setting a new trend.
I skate once or twice during the winter time but just for fun, it mostly consists of me looking like a drunk penguin and clutching onto the board for dear life. 
My feet are already hurting after two hours of just gliding around slowly on the ice and she‘s in them for much longer, doing spins and jumps and everything. Ouch! Figure skaters generally have to endure a lot of pain regularly. Probably like all professional athletes but some of these falls on the ice look particularly nasty and then boots issues, too. It really makes you admire their endurance and incredible skill even more.
Now that you bring it up, it did strike me as odd that she mentioned her coach in her commercial.
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