I mean, they already changed the name and said they had no idea about other meanings of the number 88.

My issue isn't with the concept of dog whistles, it's that when that's all you have, it's not a falsifiable accusation.

A subtle or weak connection doesn't weaken the accusation, it almost makes it stronger.
Denying it makes it stronger, and responding to it to get rid of the connection entirely doesn't even get rid of it.

I mean, look at your own language. A game briefly had the number 88 in it's name, which was also 14 letters long if you count the space. They changed the name when someone told them there was a connotation, and said they didn't know.
Based on that, you say there's a possibility that they're not secret fascists.

I'm not saying to ignore fascist messaging, but that literally every instance of the numbers 88, 14 or the word "ok" shouldn't be assumed to be secret fascist messaging without some other reason to be suspicious.
If your entire reason to suspect then consists if secret messages with plausible deniability, the reality is that the rational thing to do is to not believe they're fascists.