ok so in the end... it is true that
block checking IS possible > although limited because it largely depends on the person who blocked you (whether or not they open your convo window). although, even than there is a possibility of getting a notification, when they don't open your convo window, but the client requests a dp.
and the information you get is accurate, because the notifications you get can
only happen if the person who blocked you is online.
so i can say that block checking is possible than right?
/ 
gif 
