I hope you're not suggesting that language appropriate for 6 years is also appropriate for adults looking for jobs?

I mean, yes, grit, determination and tenacity are all great things to teach a child who doesn't know what they are (or at least what they're called).

But an adult? Looking for a job?

Notwithstanding the replication crisis, "grit" is a social psychology term that has been popularized in recent years. It's presented as a desirable trait for lifetime success. I think attributing this perceived relative debasement to a company is a bit much.

Yes, some of the language is appropriate to use for either. English has great flexibility like that. Grit is one of those words that is appropriate for either audience.