It is just hard to tell anything about high frequency with an n=1. We know for strength a twice a week frequency is better. We don’t know if adding more days will be even better. All the powerlifting routines do squats or other main exercises more than once a week.
If you are a bodybuilder, you will be dong lot more exercises than just squats. If you do all that and do squats again for a few more days,you will be screwed.
High frequency works well if you do a few exercises, not go to failure, and if you manipulate the load to manage fatigue.
People are always impressed by personal stories and testimonials. That is how we are wired.It is called availability bias. It says nothing about the probability of it working for 90% of the population.