In simple words, I cross-posted what I posted on r/ApolloApp to the other third-party app subs, that is not "spamming", if it was ever considered against the rules, the moderators of these subs would have taken down my posts at the time, well before they grew.
EDIT: Looks like posts from my account can't be seen, but anyways, I have mentioned my cross-posts of my post on r/ApolloApp to the other third-party app subs right here "Asking multiple third-party app devs consider Lemmy + Made the same post here as well" in this post.
So no, I have mentioned all details in this post, I have not missed anything, this person is spreading misinformation about me.