A lot of the points that you raise were actually brought up in discussion about the time that the stance of KKE on this topic was announced. The article you linked is, I think, the first time the decision was made public by the party gensec himself, but the text I was referring to was actually only published yesterday, so far only in Greek AFAICT. Still, if you want to have a go with a translator, this is it: [https://m.902.gr/eidisi/politiki/354061/oi-theseis-toy-kke-gia-ton-politiko-gamo-ton-omofylon-zeygarion-kai-tis].

The reality is, KKE is the strongest communist party in the country and I support its stance on most other topics, but on a few approaches its approach is at best questionable or at worst inadequate and conservative. It certainly feels like they care too much about their percentages in the elections (which, truth be told, are better than they have ever been), so far as to support homophobic views in an attempt to win conservative and right-wing sympathizers (very pathetic). Still, I find it hard to believe that they can implement their program by just winning the elections. The bourgeoisie won’t give up easily on their benefits, and NATO and EU will almost certainly react.

Still I think that if any party deserves support in the elections, it is KKE, and I have hopes that things will change for the better over time, especially considering its increasing popularity among the youth.