You want to know if long term caloric restriction along with taking a potent fat burner can mess with your metabolism…..yes it definitely can.
That’s all you’re asking right? Since you don’t want anyone else to give any other input it seems….
By the time it affects your metabolism, your fat percentage should be low enough.
And it's not a mortal drama either, just wait a few months, eat more, ditch the fat burner and your metabolism will adjust.