The article talks about both.
This device offers two network connections, a wired Ethernet connection and an optional Wi-Fi connection (using an optional Wi-Fi adapter purchased separately).
From the factory, the Ethernet connection is considered the Primary network connection and the Wi-Fi adapter is considered the Secondary network connection.
I searched our online knowledge base and found an article that talks about EIP that you may find helpful.
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I'm looking for confirmation that the WC 6515 does not support EIP. Looking at the admin guide, it list the EIP configuration in it. However, I found a post in regards to the app gallery and the WC6515 where the reply to the post was that the WC 6515 did not support EIP, that reply was from 2017. I looked at firmware read me files but did not find anything on them that stated EIP was adding in a SPAR. Before I give up on my search, I want to get feedback as to whether EIP is still not supported on the WC6515. I also looked for EIP compatable device list but was unsuccessful.