I don't know Clayton, I think Mr. Schultz is commenting on taming tweeter sounds in general, and if for some reason (a poor amplifier) someone WANTS to try an alternative (felt) that costs very little and does it in a way that does not damage the speaker except to make it look bad AND it can be removed, then no harm done.
I would not take this as an affront to your product, as much as it's a potential solution to problems that many tweeters have. My (previous) Dunlavy's were treated with felt by Mr. Dunlavy for the reasons Mr. Schultz has given, and you're right, listen to the speakers first then make a decision. And judging from your tweeter choice and what you have said, the problem would likely NOT be the tweeter.