It’s absolutely an agile idea. The core of agile development is the ability to iterate quickly. Shift left for certain things enables the cycle to shorten and accelerate iteration.
But, again, that was being done in many organizations (and for sure, in most successful chip companies) well before anything was ever labeled agile.
Which is what, honestly, makes the term essentially meaningless.
To the extent that parts of agile are and have always been "best practices" we already had a term for those.