Yes, it’s 1RM.

Some people elect not to test 1RM due to injury risk. With that said, as you do more reps, your form can break more than it would with a 1RM, so it’s really about what your priorities and risks are.

Depending on your age (<50ish, or so), I wouldn’t consider 1.5xBW to be a lifetime goal; you’ll get past that with training (I’m chasing 2x squat, 3x deadlift myself). A rough estimate from one source is that your 1RM could be over 150kg. You do 3x10, so it’s not a true 10RM.

Whether it’s light or heavy, what matters is that you’re out there working.