Could be. Like I said, I built my 24x28 shop in the fall of 2019, pre-COVID, and the total materials from Menards, everything from the slab up, door, OH door, 2x6 walls, OSB sheeting for walls and roof, trusses, shingles, insulation, etc was only $10,000. I spent $6K for the slab, $2800 hired to do the framing up to the top plate/trusses. I did all the rest, roofing, electrical ($1200 materials), trim, windows (glass block) and I spent at least $1000 on interior OSB, misc lumber. Since I bought the lumber package through Menards on their credit card, I got almost $1100 in rebate credit for more stuff at Menards. So my total in 2020 was around $21,000, so if I had hired it all out as a completely done "here's the keys, here's the final invoice" it would have been at least $42,000 back then. Now, more like $60,000 I'd assume.
You're probably right that a 24x32 completely built garage is more like $70,000.