what does 🧱 mean?

i've been interacting with many japanese speakers on twitter, and as such have been reading their websites (usually litlink). my japanese isn't great so when i get caught up on reading it i'll use MTL to verify. but i can't place what the brick emoji would signify in this context and the MTL doesn't help much either. i have to assume it's some sort of wordplay? would appreciate any help.

here's a chunk of the text:

催促もなしにお返事がないから🧱される方はお声がけせずそのまま当方を自衛🧱してください。気づき次第、当方も自衛🧱します。