I remember the day Tom posted that job. (He owns habelt construction out of Oregon.
His detail on that job is nuts. Honestly most tile setters in the field can not make it look good, especially with how long it takes.
The fact you are doing it with the tile set already, is pretty bonkers, so kudos there! Time...lots of time.
The only other tool I could recommend is a grinder 'finger' bit such as this. I don't personally care for the brand, but it's more cost effective for something like this, vs purchasing higher quality for longevity and multiple jobs.
https://www.amazon.com/dp/B087Q4SJV1/ref=cm_sw_r_cp_apa_fabc_WCN7FbZY42MMZ