The marketers did this for 5G also, calling their product 5G before it was actually deployed, only because theirs came after 4G but wanted to ride the upcoming 5G buzz.
It seems marketing /depends/ on conflating terms and misleading consumers. Shakespeare might have gotten it wrong with his quip about lawyers.
There was soooo much intentional disinformation around 5G. Everyone who wanted to sell anything intentionally confused the >1Gbps millimeter wave line-of-sight kind of 5G with the "4G but with some changes to handle more devices connected to one tower" kind of 5G. I wonder how many bought a "5G phone" expecting millimeter wave but only got the slightly improved 4G.
From a standards design perspective, there is nothing wrong with it. It's the same protocol running on two very different frequency bands. They co-exist and support each other.
5G and 4G are not terms applied to WiFi. We have 802.11a/b/g/n/ac/ax and WiFi6/7
WiFi operates in the 2.4, 5, 6GHz bands, but those frequency bands are not used to differentiate WiFi standards because you can mix and match WiFi 6/7 on all three bands.
There are also more WiFi bands below 2.4 and above 6GHz, but they're not common worldwide.
