I respectfully disagree. While LEGO may have used the Philosopher's Stone Harry for 75955, that was likely just because midlegs weren't introduced yet, and they thought it'd be odd if this Harry looked different from the rest.
Last year, a poster book came out that confirmed something I'd believed for a while: The variants in 71022 were based on PoA. While I doubt this confirms the final hairpiece (I'd hope for the 2008 Anakin hair in black, but they'll probably give all Harry's from this summer the Lloyd hair to maintain consistency), I think it's a good sign that Loa Harry will at least have smaller eyes and mid-legs.