Look at his pose. bipedal theraupod can't raise their back like this, but quadrupedal can for a short time, and his arms look long enought to toucht his own knees.
I hope for a giant quadrupedal theraupod as an apex pred. on counterpart of the giga, and it would make sense:
Giga>rex>carno>raptor
This thing>spino>baryonix> (and maybe) irritator