Okay I did the oil change today. Prior, it said service was due in 16 days, which would put the car at 6.5 months of ownership and right about 7,500 miles driven (3,000 on gas engine). After reset, it says next maintenance is due in 6 months, so it might be time based, except I've always heard that for low mileage vehicles, the oil change should be annual.
I had no problems with the underside panel connectors using a normal flathead screw driver. However, I will get a better matching one next time I'm at the store so I don't risk messing those slots up.
This was a pretty easy oil change. Far easier than my Highlander Hybrid where the oil filter is hard to reach and the oil dribbles over a couple parts on the way to the catch basin. And doing it myself, there is no concern about it not getting the proper 0w-20 oil, which has somehow stumped multiple Toyota dealers.