"thoughtful" is the key word that makes it not a contradiction logically speaking, as the author likely was writing about precisely the stress between meaningful participation leaving a legacy and mindless social media consooming.
Arguing for Claude, though, if you think of "contradictions" in the more wishy washy continental philosophy way, it fits. There is a stress between the concepts of "digital footprint" in the mass surveillance/commercial capitalism sense and "legacy" in the writer/creator sense, and it is a cool distinction to point out, where one ends and the other begins. If you read the full quote by Claude, it seems to be leading to this, especially the passage below:
"This reflects a deeper tension: How do you engage meaningfully with systems whose fundamental nature you find problematic?"