I think the two are sufficiently different and can thus be distinguished one from the other.
Yes, the filibuster rules were originally established to permit each an opportunity to debate as they wanted so that they may sway their fellow Senators. However, that soon became 'abused' and has long been seen as a rule disconnected from mere debate. Seems to me it long ago became a defacto requirement that bills in the Senate required a 60% majority for passage. (Technically, we're conflating "filibuster" And "cloture" and the 60% number has changed from time-to-time.)
So, if there is there is any "abuse" it is the frequency with which is it employed, and not in the actual use of it as means to frustrate legislation. I.e., no perversion of purpose.
OTOH, the quorum rule(s) is designed to prevent legislative mischief whereby some legislators can assemble without the others for the sole purpose of passing a bill they could not otherwise. So, in this case we have clear perversion of the quorum rules which are being used as a means to reach an objective for which they were never intended. (Note: I could be wrong here because I'm too lazy to research that state's quorum rules. And if someone can show that they have morphed into something else, like the filibuster and cloture rules have, I'll be happy to acknowledge it.)
I.e., he is more or less correct and you are not.
Fern