They banned it in all channels, and told their employees to chat on Signal:
“ People can take the conversations with willing co-workers to Signal, Whatsapp, or even a personal Basecamp account, but it can't happen where the work happens anymore.”
So - it’s not like what you asserted, at all. What you asserted is somewhat reasonable (even if I would want to nitpick at the edge cases) ... but they’re not saying anything close to what you’re saying.
