If anyone is curious, I asked Tesla if, due to the pandemic, they were extending supercharger miles received when ordering through a referral link. See below for their response:
Thank you for contacting the Tesla Referral Program regarding your supercharging miles. I am sorry to hear you may not be able to use your free supercharging miles. Referral miles and their expiration date are displayed in your Loot Box, and unused miles are removed upon expiration. Please understand we will not be offering any individual extensions to ensure all owners utilizing the Referral Program have a consistent experience