The ultra test game in question:

Vintage tier looking good.

Yes in most vintage tanks and especially alecto and uc 2 pdr you are able to manually back and frontflip. This is just a short clip but you can flip much higher than this.

Trick is to drive forwards and then instantly go in reverse and vice versa if u wanna backflip. Sometimes the bug just ramps up and well ur tanks starts tweaking out and you'll get what happened at the end of the clip.