[Question] Randar on version below release 1.9

[konoashi]

I've been looking at this magnificent exploit closely since this paper is public and after a little bit of research in MC sources a question started to haunt me, how can we know item exact coordinates before protocol version 106 (release 1.9-pre4) since the server send 3 integers for x, y and z using floor_double method thus destroying the information of the exact position for the client since the client precision is down to a 1/32 of a block. I assume randar cannot run using block drop coordinates below 1.9 and it's necessary to find a pseudo random event with an output that the client can know with absolute precision, I am right ?