I'm sorry you couldn't launch it :/
I did just tried on the same Chrome version as your own but I was able to launch it. This error is not unfamiliar, as this is the reason why itch io has an option when posting a game named "SharedArrayBuffer support — (Experimental) "... But the option is enable in my case.
I however did found a message about that bug on the itch io dev forum . It may or not be related to your issue, but I do use Godot 4 as an engine and a lot of people finding my game seems to use the random submission page :
(They seem to advise to open the submission in an other tab with control-click ?) In last resort, you could try the direct embed itch dot io page of the game, but if it's still doesn't work... I don't know. This seems to be more a server/host website problem.