I'd caveat that slightly: only if the senior engineer is not also overburdened with other responsibilities, and the team has the capacity to take on the intern in the first place. I've been on teams where I felt like we desperately needed more FTEs, not interns. But we could hire interns, and not FTEs.

(I agree with the premise that an intern or junior eng is supposed to be mentored, and their mistakes caught. How else should they learn?)