Any of the head coaching candidates that received an interview request likely would've viewed Goff's 7 game sample size of the Rams this season. I would think they have also watched his college film to some degree to get a strong evaluation of his skill set.
The HC candidates wouldn't observe his body of work with the Rams like many of the disgruntled fans that expected him to light up the league, or even just expected him look more serviceable as a rookie etc.
The HC candidates clearly would be doing their homework on Goff and some of them might still might be reviewing his film to prepare for up coming interviews.
Goff is a major selling point (good or bad) for a highly coveted HC candidate to make their own judgement and estimation for considering the job.
If he's got the potential they believe they could tap into, it would make accepting the job much more desirable for a candidate on the fence between choosing the Rams or another team.