... No. Many people suffer from partial or full paralysis of facial muscles, neurological conditions that limit expression, and numerous other conditions that will forever and permanently limit their ability to engage in expressive body language.
but these are very rare things. The person you originally responded to did not mean anything against anyone who has these things. I've met many people in my life that were convinced they were unable to do things that they were quite capable of. Stephen Hawking was still quite expressive despite his limitations, although they did come later in life
Sure, but have to understand that a limitation of language is that it doesn't convey perfect information. When someone says "anyone can do it", they mean that most people with full-blown "stuck in the house for years" social anxiety, can actually do it, and they meant nothing negative against those who are truly physically disabled. People summarize their thoughts when they speak and try to convey a picture that most people can understand; they are not trying to hurt anyone
Someone has clarified it twice yet you're still fighting the word "anyone" instead of trying to view it through a reasonable lens. If his point only makes sense because he excluded a very rare group of people, then your point only makes sense because you include a very rare group of people. Have some grace, be excellent to each other.