they are. They spend more time in telegram and reddit than on bitcointalk, but they occasionally check this site. I have access to reddit but not to telegram, so when I see something that I feel they should know about, I link to the bitcointalk post in a post on reddit and ask someone with access to telegram there to check with the devs.  For the BTX asic issue, they are aware of the situation (from which I imply that they are looking into it).

see here : https://bitcointalk.org/index.php?topic=1883902.msg48305435#msg48305435

which references this : https://www.reddit.com/r/bitcore_btx/comments/a1a4on/are_we_under_a_51_attack/

in which one of them with direct access to the developers replies, and in which I also reference this : https://bitcointalk.org/index.php?topic=1883902.msg48329439#msg48329439