Conte had no problem saying Spence & Danjuma were club signings so i think we can deduce from that the others weren't otherwise we'd have heard about it.
It's the usual brick, people despite lots of evidence can't accept that everything wasn't the club's fault
1. As you rightly pointed out, any player that wasn't his signing he immediately called out as club signings (Spence, Danjuma), and any pre-Conte signings that were promising got same treatment (Gil, Sarr)
2. Profile, does anyone really fudging believe Perisic (over 30, high wages), Richi (£60M for a bench option), Bissouma (established PL midfielder probably worth £40M-50M, only less due to time on contract) and Porro (£40M+ with significant amount paid up front) are Tottenham/Levy/ENIC type signings?
3. Add Bentancur & Deki, basically Conte got 5 players that were intended first team starters plus one very expensive squad depth in two windows
The fact that he didn't make them/it work doesn't suddenly make them club signings