There is no debate here, I think, it is just a healthy conversation on how we view things regarding the calculation of buy-in features reward multiplier.

Friendly debate
Maybe you guys are right, idk 
Just my first time hearing this. No worries

First off, yeah, it's a friendly debate,

, and with bonus or not, 2442x is a great win, so, all of us here, we are happy for you, mate!

It is just so happened that none of us discussing it here, was ever playing with bonus feature, so we can only theorize on this matter, while you, I assume, can know it for certain.
So, the question is, what multiplier did you see in the Leaderboard column "Multiplier" when you hit that 2442x?AFAIK the multiplier contest on chips.gg does not allow buy bonus feature, logically it will not be listed under the leaderboard as it does not count for the contest. Unfortunately there is no bet history (for the slot games) on Chips like what we used to see on almost all other casinos. If there is bet history tab, we will know easier about the exact multiplier and exact difference between winning with buy feature and winning with normal spin.