How about just saying what you mean instead of expecting people who don't know you to guess your mind? If someone isn't a member of your personal circle of friends, they're unlikely to know when you're being sarcastic and when you're not unless you clearly state you're being sarcastic.
You want reading comprehension? Let's go for it.
That's all you gave us to work. It was a random insertion into a discussion about Starlight Celebration so we can't use the discussion for context outside of FFXIV being the game you're referring to.
You used the word "though" at the end of the question, which indicates doubt. Adding "actually even" into the question indicates the doubt is fairly strong.
You strongly doubt anyone will be playing the game in a week and are asking others if they agree.
The "Big Grin" emoji - happiness, excitement, anticipation, gloating, different people use it in different ways.
So are you happy you there may not be people playing the game next week?
Excited about that possibility?
Anticipating that possibility?
Gloating over that possibility?
All those possible uses of "Big Grin" give your statement of doubt the appearance of an attack on the game, especially since forum users saying "no one will be playing this game in a week" and similar things has practically become an idiom within the gaming community for "this game sucks and I hope it dies".
You're the first person I've met who claims the "Big Grin" emoji indicates sarcasm. You would have been better off using the "Roll Eyes (Sarcastic)" emoji though in this case it might still have been misinterpreted.
If you had just said what you meant instead of assuming strangers on the internet would automatically know you were being sarcastic, it would have avoided the misunderstanding. Saying "People will be playing this game next week" would have still been out of context for the discussion, but no one would have interpreted it as an attack.
There's no one projecting their own "doomsayer" feelings here, just some posters assuming (understandably but evidently incorrectly) that you meant the game is failing then expressing their disagreement.