Thank you for taking the time to explain what, at the time, looked like odd decision making.If you watch PoV recs its very likely from what he could see (4-5 barracks with flags on them), his first expectation from Villese was mass Halbs with CA behind so he thought about Champ/CA.
He went 150 Vils just for the sake of having an eco to do 2 expensive Gold armies but got kinda suprised by the HUssar switch of Villese. SO he went back to Camel + CA and got out of motion with that 180 tech/unit change imo. He just wasted some res worth like 3 camels on that 2 Inf techs he got, so borderline not even any impact on the game at all btw.
Villese also did a perfect job sniping Vipers way higher CA numbers at all times till he was in favor himself.
And CA+Camel is literally the only comp Saracen can make vs post imp Magyars spaming MagHUssar+CA ....