You need to hit the actual download button. Not "Download now", or "take me to the downloads". The last button that says download and would open a file download dialogue.
Those others might not have clicked the last download button and reported to you, that the game is not quarantined. And I believe the account owner will not see that message.
Maybe the game triggered updated scanners. At least I do hope that Itch scans old files with updated malware scanners.
Also, a quarantine message does not prevent a download. It is just an additional dialogue box with a warning.