Looks like back of semi? ...
No, I don't think so, that's not near enough damage if he slid into the back of a "semi" trailer bumper.
In the above pics you can see the LS entire bumper structure is still intact and not pushed in totally.
(to me) it seems he slid into the rear of pick up truck or SUV with a trailer hitch.
The large black mark in the center of his bumper seems to indicate he may have slid into the back of a pick up truck hitch ...
then picked it up and got underneath it a bit at headlight hood height.
A semi trailer crash impact bumper, also known as an "Underride Guard" sits lower and on full impact would have shoved
his entire lower front end (bumper w/lights) into the motor compartment. It would look more crumpled up and all pushed in.
---- EDIT:
Hmmm, looking at mlara pics again some more, with his LS sitting so low, a semi trailer bumper guard could have been high enough for him to only catch it from top of bumper up. I just think it would have done more damage than what's shown. plus the black mark in the center of his bumper seems like a hitch of sorts to me.
Got me wonder now ... He'll let us know what happened.