Generally speaking would I worry that an adult with a risqué sense of humour was a predator? No. Not my kind of person, absolutely. Not safe? Depends on the comments.
It's not that they are a predator, it's the step before. Pushing appropriate boundaries. Is it professional to be making those comments at work with very young children around? If that is seen as ok, and humour can be individual/ cultural, what else could be missed?
are staff able to challenge that and say that it's not appropriate? That review misses out that staff did not feel they could. Which leads to a culture where people routinely don't challenge the small things.
Small boundary issues can lead to larger boundary issues or simply a lack of wider contextual understanding of and what is appropriate for the setting. The more some smaller things are normalised and seen as acceptable, the harder it is to maintain the boundaries and perspective on others.