Absolutely, positively........ not true.

If the cam is ground with inadequate lobe taper, causing the lifters to not turn...... how is that not a cam problem?

I’ve seen that situation many many times.

Or the guy over on FABO that had the SBM Hughes cam(ground at Howard’s) that had .007(7 thou) lobe taper that had the lobes chipping away from the edge loading.
Again...... not a lifter problem.

This lifter came off a hyd cam that had under a half thou lobe taper:
No taper...... no spin.