The house can always see the hole cards of all players on the table because the poker software allows so. There is no need to employ any bots whatsoever. I have heard before about casino staff colluding with normal players pocketing the profit. But this is illegal and will get anyone fired or worse sued.
If you want to read more here is a very interesting piece about a pro poker player using a God Mode program to cheat casual players:
https://www.pokernews.com/news/2013/05/audio-tapes-expose-ultimate-bet-cheating-scandal-14986.htm