But in this case, the meaning stays the same even without the /s, because the key message is factually true and the sentence still functions as a contra to the previous comment.
It doesn't change the intended meaning but it can change the interpreted one.
For example when I write "I love to give my data to Google /s" you can be sure that I actually do not love to give my data to Google, whereas leaving out the '/s' I could have meant it sincerely (for example, because I want targeted ads, perfectly tailored to my needs).
This example clearly illustrates the totally opposite interpreted meaning.
But in the case of the comment we are discussing, disclosing the sarcasm makes no difference to either side of the conversation (the sender and the readers)
Someone needs to turn the hyperbole dial down on Lemmy. My feed is frequently nothing but Chicken Little's whining about trivial shit. When something truly egregious comes up, I'm not going to be able to see if in a sea of outrage.
Privacy, FOSS, leftists -- all of these communities have a very large presence here, and while I love all of them, they do tend to love their purity tests. Purity tests have been a constant in these communities for as long as I can remember them existing. Lemmy just has a high concentration of 'em.