Irreconcilable date in api/v2/user response

Interrogating https://plex.tv/api/v2/user is returning a value that I cannot reconcile in regards to my own known account information.

My user attribute joinedAt (‘1413264741’) appears to be accurate. However, my subscribedAt (‘2021-03-24 04:47:17 UTC’) is not correct. My lifetime Plex Pass subscription was made on Oct 29, 2017, which I can confirm at https://account.plex.tv/payments. The subscription detail via the API is accurately notated as plan="lifetime".

I haven’t been able to reconcile what this date would be, if it isn’t just simple wrong.

Thanks for any info. I couldn’t find a match to the attribute over at https://developer.plex.tv/