Sometimes the term "packager" is used instead of "bundler". Honestly though, "compiler" is the term most likely to cause any confusion. Even if one is not familiar with packagers/bundlers "js to exe ${unknown phrase}" still conveys things more clearly than "js to exe ${misleading phrase}".

But it's definitely not a compiler! I think "Astra - a new js2exe bundler" is much less ambiguous because it's... a bundler!