NO, the email you've received from John Mihin is not a genuine contact from Fanatical.
( also see 'Fanatical.ads@gmail.com is not genuine' -- https://support.fanatical.com/hc/en-us/articles/38351383851282-fanatical-ads-gmail-com-is-not-a-genuine-contact-from-Fanatical - )
If you'd like to discuss this then please open a support ticket with us, but we can confirm this personal does not work for Fanatical, nor Fandom.
The genuine marketing team can be reached at marketing@fanatical.com
The affiliate team can be reached at partners@fanatical.com
Fanatical will only contact you using the email domain Fanatical.com or Fandom.com
We hope this helps.
Customer Support Team.