Haydn Fleury is the player in question.

Well if we're comparing Fleury to Andersen in value fleury is a much younger RHD who still has room to grow. Andersen is now 31 and at the end of his contract. Theres no guarantee he'll resign with Carolina so right now his value is priced as a rental. Lehner only fetched a 2nd and a fringe backup in Malcom so it's fair to assume Andersen and a 2nd would be fair value for the rights to Haydn Fleury.

Disagree. A rental without Andersens track record is who you chose as a comparison and one that was expected to stay for a couple of months instead of a year at least. Andy should be worth more.
Besides that Fleury hasnt lived up to his draft ranking and shouldn't be expected to grow exponentially.
On top of that the trade proposed has the Leafs adding a 2nd, I think the 2nd alone is Fleurys value, never mind Andersen.
The Canes need to add here, not the Leafs