Looking at the FCC photos, this seems to be MediaTek-based: MT7986AV, MT7976AN, MT7976GN.
PHY: MaxLinear GPY211C0VC (SLNW8) 2.5Gbit
Flash: ESMT F50L1G41LB 128MB SPI NAND
RAM: Samsung K4A8G165WC-BCTD (1GB?)
I suspect it should be relatively easy to add OpenWrt support for this device.
It also comes with CC2652, so it should be possible to suppport Thread and/or Zigbee, iiuc.
I might get one of those and have a go at adding support. The 128MB RAM on the EAP615-Wall is proving to be problematic with extra software like lldpd, prometheus-node-exporter-ucode, snmpd.