First of all, There no is hack to use spells in fog, as clear here you reported someone without check replay.
As clear too in game you warded, he bought 2x obs.
Also you can see ingame how plays.
https://prnt.sc/hLLqftL7CDxY Denied, Make sure before reportin some1. pls
Edit:
06:20 jj_cris [All] HOW THE FUCK U SEE ME IN DARK
06:22 nrgdvl [Allies] !p
06:24 jj_cris [All] I WILL CHECK MID NOW
06:28 jj_cris [All] IF NO OBS
06:32 jj_cris [All] ENJOY UR PERMA
06:58 jj_cris [All] ENJOYR UR PERMA AFTER GAME
07:42 jj_cris [Allies] HE HAS MH
07:48 jj_cris [Allies] NO OBS AT MID