No they aren't. Deer are often struck mid-bound which will absolutely send them flying into your windshield. Also, depending on what part of the world you are in, deer can get pretty huge.

Moose are technically deer (taxonomic family Cervidae, which also contains reindeer, red deer, roe deer, etc). And a big bull can weigh almost a (US conventional) ton. I don't know whether that's enough to trash a modern semi (based on an old memory of an apparently undamaged semi and a dead moose on the shoulder of an Ontario highway in the 1990s, I'd guess probably not, or at least not always), but I wouldn't want to be the driver of the semi, either. Hitting them in an ordinary passenger vehicle—like any Tesla product—is something you really don't want to do.

Moose are worse because they are heavier and the impact means most of the body mass goes ibtonthe windshield, but deer go right over hoods and into the windsheild on most cars too.