Just to be clear, I agree with you on the low temperature charging advantage of SiO2 batteries. However I would argue that there are other ways to deal with this.
One other thing I am not following is a major price advantage of SiO2 batteries. I think the ones that were referenced were these:
https://www.azimuthsolarproducts.com/product/12v-108ah-ultra-long-life-battery/
Which are list at $621 and are on sale for $558. LiON energy batteries are regularly on sale at Costco for ~$730 for 112Ah. So yes the SiO2 have a slightly lower up front cost, but based on their spec'd lifetime the LiON total cost of ownership is much lower.