No, it isn’t. Can you install Flatpak apps on Android? Can you plug it in a monitor and run GIMP or desktop version of Firefox? Because actual Linux phones can.
The difference is that Android phones only use Linux kernel and it is so much modified by SoC maker and OEM that by side effect it can’t run anything beside Android anymore. There are projects like PostmarketOS trying to port real (mainline) Linux on phones but it takes awful amount of work and supports like 5 phones still with no things like cameras. There are also systems like Droidian trying to strip Android to bare minimum and run Linux on top of it like an always-on-top app, but this also is only for a couple of phones.