There's a question on the site concerning tethering detection (on the part of mobile carriers). The accepted answer ranks highly for searches on this topic and is often cited on sites like reddit.
The section on detection via MAC address is blatantly wrong and suggests a misunderstanding of network fundamentals. Yes, at the physical layer there is a concept of a MAC address - but the phone will be doing NAT when tethering! Numerous comments have identified this issue. Ideally this entire paragraph needs removing or at least considerably revising.
Unfortunately the question is locked, and as I discovered in the chat, no edits can be made. I'm not debating the reasoning behind the question being locked - but it seems silly that it's still discoverable but cannot be corrected.
Is there any way the answer can be corrected?