They are questionable because she is using these statements as a scapegoat. I don't find any conclusive studies that prove her statements.
In fact:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2795070/
Asian females have the smallest skeletal muscle mass.
https://www.researchgate.net/publication/262020856_Ethnic_and_geographic_variations_in_muscle_mass_muscle_strength_and_physical_performance_measures
A measure of speed and strength between ethnicity showed that all Asian values for muscle strength was lower. In terms of measuring speed, Asian and Caucasian values were similar.
http://www.forbes.com/sites/jonentine/2012/08/12/the-dna-olympics-jamaicans-win-sprinting-genetic-lottery-and-why-we-should-all-care/2/#3ab274fc2315
ACTN3 is a gene that is found in a lot of athletes who are good at sports that involve power and speed. This is a gene that makes fast twitch muscles twitch quickly. Given that she says that Asians have more muscles and are fast by nature, then should Asians have the muscle strength/mass? Shouldn't Asians have more of the ACTN3 gene than European/White ancestry?
According to this article that explains a study by Human Molecular Genetics (Oxford Journal), the trend says no.
http://www.slate.com/articles/health_and_science/human_nature/2008/12/white_men_cant_jump.html
The RR variant in the gene is found more in European whites than Asians. The opposite variant, XX variant, is found more in Asians than Europeans.
Of course all of these studies and articles provide
evidence, not
proof. The evidence provided above show her statements about Asians are likely unfounded. In addition, this season didn't go so well for her teams because
a) Fedor was injured horribly and competed at worlds despite being unable to lift his arm 2 months prior
b) Max and Tat performed below par at Worlds.
If she wanted to defer to ethnicity as an explanation for their mixed seasons, then Asians and her teams should have performed perfectly and Asians would have gotten the higher score. But no, S/H fell on their 4STh attempt and botched the 3S. S/K messed up a couple elements and could not perform to their GPF caliber due to Fedor's injury. V/T messed up a lot of elements included 2 footing the throw in the SP, didn't get the jump combination and completely invalidated a lift.
Also what Chinese Canadian won? Patrick came in 5th. Meagan and Eric are not Chinese-Canadian last time I checked. If anything, Meagan is probably the most muscular out of all competing females right now
Her skaters couldn't bring their best to Boston. Was race/ethnicity a factor? I highly doubt it.
Fedor Klimov
I think they should have made the decision to let S/K sit out of Worlds. Ranking points/berths aside, think about the long-term and not aggravating Fedor's shoulder is probably a wiser idea. S/K are in their mid-20s and could go for 2 more Olympics.
Russian females
While I don't think anyone can deny that historically women have been at home more than men, I think it's pretty far fetched to use this as causation in a sport.
:
.... of course genetics play a big role in how successful you are in a sport, it's not like you can say 'oh Asians are winning too much here, let's change the rules because this is unfair'!
She does sound not perfectly politically correct. Generalization about Asian culture and "men are hunters, women are housekeepers" sounds more like sexism to me. 
