Seems like you’ll be SOL on this offer for your Platinum+. The terms of the offer at the bottom of the Ariya page are (emphasis added):
$500 EVgo charging credit offer only redeemable by the first 10,000 customers who (i) reserve a 2023 ARIYA by January 31, 2022 , (ii) purchase or lease their reserved 2023 ARIYA from a participating Nissan dealer located in an eligible market by no later than December 31, 2022, and (iii) register and activate a customer account with the EVgo network within 365 days of date of sale. Must use credit within two years from ARIYA purchase or lease date. Charging sessions beyond the credit amount are subject to additional fees. Offer cannot be combined with other offers, is non-transferable, and not redeemable for cash. Fleet customers not eligible. Other terms, conditions, and eligibility criteria apply. Visit nissanenergyperks.com for full program details (including list of eligible markets). The EVgo network is owned and managed by EVgo, and is not within Nissan’s control. Availability of charging stations not guaranteed. Reservations may exceed initial vehicle production levels. Therefore, Nissan cannot guarantee delivery of a 2023 ARIYA by any specific date.