Guessing this is a price error considering the incorrect copy/paste job they did in the weblink.
Have only ordered 18650 batteries from the 'maker' Lanplus which were genuine, so not sure how their big batteries are. Worth noting there's a bit of discrepancy in the discharge rates claimed in the images vs the specs.
Back in early 2021, eBay was running 20% of select sellers. One of the items was a 100ah lifepo4 12v battery listed as $399. Became $319 delivered after coupon - that's become my reference for generic 100v lifepo4 12v batteries.