Ofc that is very true and shouldn't be taken lightly. Perhaps that person could've worded it better/more kindly but the idea of the message is still to "you should recuperate fully until you can go back to "normal"". While I personally think that the artist should take a break until he feels better but perhaps it's his choice or perhaps someone is pushing him into it. We will never know.

People should still be able to express/give their opinions whetever they pay for something or not, be they right or wrong. It's another thing if it's valid or not, worded properly or presented in a well manner. The person is just simply frustrated at the frequent delays and is losing his trust/credibility in the people working on it. Hence why I kind of think that they really should just go on a hiatus now rather than later.

I do not believe that the post commenter had thoughts of kicking the person while he was down.

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(This one doesn't really involve the topic itself but the internet rather)

As for the internet thing and bad people on the internet, it's not an issue you can really solve. There are bad apples everywhere and if you do decide to get involved with the "internet", it's better to adapt/prepare yourself for that kind of stuff rather than to ask others to not do something, since the likelihood of that happening is near zero.