Right—with the quote made without center field explicit within, or in direct response to a question about center field, it is at least 50/50 that Petzold broadened the context of a statement Harris made when he might have been thinking about his infield work, versus Harris making the statement in an unqualified way.
All that said, even though Kreidler played two innings of CF in 2022 and one inning there last year, there's probably a good reason he hasn't played any more innings there, so I would be surprised to see someone Harris regards as an "elite center fielder" have his time so limited there. I'd bet it's the same situation as Baez getting reps in center: we need a third or fourth option to play there if we see many more better options go down to injury.
I think the idea of kicking the tires on Moniak is interesting, although he is essentially a left-handed hitter, which we are lousy with, and there's probably a reason a team much worse than we cut bait on him.