In my opinion it becomes stat padding when:
a/ the other team is just intentionally allowing you to score (which quite frankly doesn’t happen)
b/ you are up so much that you’re just cherry picking at the red line (even then I don’t consider it stat padding, because players play like this even if they’re down)
c/ if it were so easy to “stat pad” why not just use that effort to gain a lead? just because you’re up, does that mean you should intentionally miss an empty net?
Honestly, in a game that is 8-1, most of the time Goals 4, 5, 6 or whatever is just as hard to score as the first goal.
At the end of the day, these are professional athletes whose performance and number basically equates to their livelihood. You don’t want to be the team that loses a 5-1 game because you don’t want to “stat pad” aka playing at your best.
However there is a caveat when talking about international play. If you’re Canada and are up 7-1 at the end of the first against Team Zimbabwe maybe dump the puck in the corner.