This paper is about tracking Bitcoin through centralized mixing services. There is no mention of coordinated CoinJoin services, like Samourai Whirlpool or Wasabi.
Correct, not as far as I can tell. The methods they describe may be applicable to CoinJoin services (at least the very high-level methods are applicable), but they didn't show any testing with these sort of transactions (unless that's covered by one of the two "Unknown"s, which isn't likely).