I submitted an offer on one of his listings as well. Never heard back. Found out the listing sold when it was removed from the site days later.
I also had a full price offer not get responded to, that I happened to submit seconds after the listing was posted. I was excited because I never catch any of Fidelity’s postings and just happened to hit refresh at the instant my ideal contract was posted. Found out later in the day when I called that someone had somehow beat me to it.
From every listing agent I’ve talked to across multiple companies, it seems to be a bit wild and overwhelming at the moment! If I haven’t heard back within a day I usually call just in case.