Unfortunately I think the fact that this is cooked meat kind of disqualifies it from the sushi classification

Not necessarily. Unagi is smoked eel, and is commonly found in nigiri like this.

But that’s fish. Not meat.

Why? There's kappamaki, which is rice, cucumber and nori. No fish. But it's still considered sushi.

According to google for the definition:

“a Japanese dish consisting of small balls or rolls of vinegar-flavored cold cooked rice served with a garnish of raw fish, vegetables, or egg.”

Both examples ive been given meet the definition. Rice and roast beef still doesn’t.

it’s the rice that gives it the classification :)

Technicality. I'd still consider this nigiri and I'd eat it.

Raw fish is one of the traditional ingredients in sushi but sushi may also be made without meat or with cooked seafood as long as it uses vinegared rice. Sashimi, on the other hand, always contains fresh raw meat or seafood.

Source https://www.diffen.com/difference/Sashimi_vs_Sushi#:~:text=Raw%20fish%20is%20one%20of,fresh%20raw%20meat%20or%20seafood.

Never said I wouldn’t eat it. Let the downvotes commence lol

I won’t argue about anything here. My Japanese friend did them and I warned her she may loose here Japanese citizenship when this gets public ;-)

Whatever it is, I’d happily smash it all with plenty of strong English horseradish sauce or wasabi.

You can only get away with this using A5 waygu licked lightly with a blowtorch

This is pretty common in Japanese BBQ spots to my understanding

You can find roast beef sushi at any conveyor belt sushi restaurant in Japan. Nothing at all about this is illegitimate. Keep on beefin’ on.