kfc use to use a proprietary pressurizing frier and bricks of conglomerate animal tallow yes. the friers had a slot you slid them in during prep. now since early 2000s they use a generic industry drop frier and load them with canisters of processed rape and canola oil iirc. just like almost any other chain does, and is why any of the modern standard fried goods are all the same level of meh comparatively.
Kekistani