Urgot wasn't released on steroids mode, now you are just making up stuff.
In fact, his release was really weak and they buffed his reliability several times after his release to make him stronger (like giving him less delay on his Q explosion, fastening the projectile speed of his ult, etc).
Here the first changes he got after his release.
Purge Purge
Purge now refreshes the duration of the "locked on" debuff, preventing cases where Urgot would switch targets partway through Purge's duration.
Disdain Disdain
If Urgot casts Disdain during Purge Purge but fails to toss a champion, Purge Purge will now resume firing for the remainder of its duration 0.375 seconds ealier than before (lockout period reduced to 1 second from 1.375).
Fear Beyond Death Fear Beyond Death
Slow duration and reactivation window increased to 4 seconds from 3.
Followed by these:
Echoing Flames Echoing Flames
Leg cooldown reduced to 30 / 20 / 10 / 5 / 2.5 (based on level) from 30 / 25 / 20 / 15 / 10 (based on level).
Removed: Leg cooldown being affected by cooldown reduction.
Maximum health ratio reduced to 2 / 3 / 4 / 6 / 8 (based on level)% from 4.5 / 5.25 / 6 / 7 / 8 (based on level)%.
Corrosive Charge Corrosive Charge
Mana cost changed to 50 at all ranks from 35 / 40 / 45 / 50 / 55.
Time before detonation reduced to 0.5 seconds from 0.85.
Fear Beyond Death Fear Beyond Death
First case missile speed increased to 3200 from 2100.
Reliability is a big strength in this game, he was busted because they increased his reliability across the board. But his release was extremely weak, simply because you were not able to hit anything on a competent enemy at all.
Oh, and these changes happened 2 patches after his release. So not "hotfix buffing him into steroid mode" either. They let him sit in his weak state for a while before buffing him.