These "Lite-managed" switches typically don't run Linux, but rather have an
8051 core in the switch chip that provides a very basic HTTP interface where you can configure a limited number of VLANs. The 1990s style basic HTML management interface UI is a dead giveaway:
View attachment 45580
View attachment 45581
They're strictly L2 switches.
Personally, I am not a fan of these switches since custom firmwares are typically a hack job on the original closed-source firmware, and you have no way to know if there is a backdoor.
Check out
models [Switches] if you want a good list of switches which can have (but not necessarily have) OpenWrt support.