Re-releasing old skins was the damage control, not the "compensation"
The reason Riot re-released the old skins was to prevent the mass amount of newer players from raging out when they only released two (although only one is Halloween themed) Harrowing skins with no Harrowing map.
The compensation means absolutely nothing to Riot. They create RP out of thin air. Re-releasing the old skins allows Riot to still earn a profit off of the newer players while providing a form of damage control preventing them from complaining about the amount of new skins they created.
This Harrowing we get:
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a 1350 Zyra skin as well as an Officer Vi skin. The Officer idea is hardly a theme unique to "The Harrowing" when we have police/swat themed skins with Graves, Blitz, Caitlyn, and more
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a new way to give Riot our money for RP in the "random skin gifting" system, once again manipulating newer players into trying to get limited & legacy skins, as well as the more expensive Legendary skins
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a couple of summoner icons we "earn."
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Furthermore, Limited Edition skin owners get the shaft even MORE with a chance at buying only one new "Harrowing" themed skin in Haunted Zyra.. and it's 1350.
Riot is decreasing ways of getting IP (they've lessened it per game, they've removed IP from custom games) while increasing RP and IP prices (7800 IP champions, 1350 / 1820 RP skins) overall as well as cheap ways to give them RP (re-releasing old skins, skin gifting roulette)
I will not be surprised at all when the same happens during the Christmas skin sales.