Thanks for doing this, Rusty!
Yes, it looks like vehicles are being included in an infantry tutorial, but the last special rule for this scenario says they're being treated as infantry.
Technically, they are infantry platoons, but their carriers (small, open-topped, lightly-armored, tracked transports) figure into their stats and rules. In 18.T1, they are carrier-less. Just assume that their carriers dropped them off in the starting hexes.