I instantly searched for that, after wendell released his video on the Flex series.
It seems not, according to Intel: https://www.intel.com/content/www/us/en/support/articles/000093216/graphics/processor-graphics.html
Intel® Arc™ A-Series discrete graphics family (Formerly Known as Alchemist) Not Supported
On the other hand, I run my A750 on a B350 chipset with a Ryzen5 5500. It can do ReBAR so it runs perfectly fine, but the official website states otherwise: https://www.intel.com/content/www/us/en/support/articles/000096161/graphics.html
AMD Ryzen™ 5000 Series Processors AMD 500 Series motherboard with Smart Access Memory enabled