Nevada makes an excellent point
Many people get the cylinder layout wrong on Toyota and Lexus vehicles
Here is a document which lists the cylinder layout for the 2GR-FE V6, which you have
Toyota’s layout is not like GM, Ford, or even most european vehicles
I wouldn’t be at all surprised if he replaced #6 coil and plug, thinking it was #5
I’m not being a spoiler
It’s just that I’ve seen these things happen quite frequentyly