I'm not a fan of Rokas, I don't think he was that good to begin with and I'm not into the whole youtuber persona he built for himself. That being said, he had the balls to set clear goals for his training and publicly tested himself against those standards. That alone is worthy of respect in my book.
It's ultimately a matter of claims and critical thinking. If one asserts that his aikido training makes him better at fighting, there exist ways to test that, and if he doesn't do it people have the right to question the claim. And there are aikido people who say it's effective without supporting the claim. If they said they're just training for fun, it would be completely fine.
Budo people tend to chalk up the whole ethical, moral and spiritual aspects of their arts and often suggest that modern (especially western) arts are completely devoid of these or even encourage bad behaviour. I wonder whether it stems from an inferiority complex from traditional martial artists regarding fighting effectiveness. "My dad couldn't beat your dad in a fight, but spiritually he would kick your dad's ***".
In any case, the situation is much more nuanced. Even in the West, since Antiquity, sports have been associated with moral and spiritual development, and this continues today. Conversely, Budo have been used in pre-war Japan as a way to condition the youth for the country's upcoming wars of expansion. In aikido, a good example would be Tadashi Abe, who was reportedly dejected that the war ended as he wished to die in a suicide torpedo (kaiten) attack, "like a samurai".
To MMA's Joe Schilling KOing a rando in a bar, aikido can raise Bruce Klickstein, 5th dan under Morihiro Saito (a direct disciple of aikido's founder), who was convicted for abusing his underage students in the 90s and was recently convicted again for possessing and diffusing child porn.
My moral values certainly don't come from my training and in general I find it difficult to have meaningful conversations about things as nebulous as the ethical, moral or spiritual concepts of martial arts. In order to discuss the spiritual aspects of aikido I would need to study the founder's incredibly complex and personal worldview, including things like the Chinese Classics and Oomoto-kyo cosmology. Ain't nobody got time for that. That's one of the reasons why I'd rather talk about technique.