“Implicitly implied” is redundant. Either of these phrasings would suffice:

> It is implicit in many comments.

> It is implied in many comments.

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Well, it's called "tautology" and it's a perfectly valid rhetorical device.

A tautology is a sentence vacuously true. This is called a pleonasm.

Was about to post the same thing. It is indeed the under-appreciated pleonasm rather than a tautology.

Yes, mixed the two. Point stands though.