OWC also posted a tear-down, and also failed to identify a discrete wireless module. They show all the parts on a table and closeup of the mainboard. No discrete wireless card.
This may mean that to get Wi-Fi 6 on this machine, we would have to look to ThunderBolt adapters or PCIe cards.
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But be sure to look closely at its 10G Ethernet capabilities, that is TWO ports of (up to) 10Gigabit-Ethernet over-copper, which is way faster than the best Wi-Fi. Using 'good' cables without being too sloppy can easily provide high speeds at modest cable lengths, and following all the rules using the best cables and no 'cheats' -- between 55 meters and the full 100 meters.