nope, it will renew with the latest expiry date (promo validity period doesn't stack)
example: you are registered with gosurfbe34 November 4, 2020 12:00pm, expiry date November 19, 2020 12:00pm
and register again gosurfbe34 on November 4, 2020 1:00pm
new expiry date November 19, 2020 1:00pm, not December 4, 2020 1:00pm
this is how it works