There are more guaranitica type salvias entering the market every year. This appears to be another one. I was looking through a list of 2019 trial garden plants a few days ago and there was a group of guaranitica salvias from a plant company called Hilverdakooij. One of their salvias looked like the one in your photos. It may be the one called salvia 'lake tahoe' on their website... just a guess.