User blog comment:TimeShade/The Crisis Has Arrived/@comment-44403021-20191207140956/@comment-26537965-20191207181751

Just because they did not put Rex s entire biography there does not mean they do not treat it as canon. The fact that they have a link to his page on the Generator Rex Wiki and that they also have that on the pages for the other Generator Rex characters that appeared in the crossover means they do treat it as canon.