[AJB39]

It's being reported by The Sun, who seem to have a pretty good track record with TV stuff:
www.thesun.co.uk 

Cancellation not confirmed. That article says

A show insider told The Sun: "Ninja Warrior has been axed for this year, but could return in 2024."

In other words, that they just didn't make a series for this year because the rugby will pre-empt it.

Ditto Masked Dancer.

A show insider told The Sun: "Fans will be gutted, but The Masked Dancer is being rested for 2023."

"Instead, ITV are showing the Rugby World Cup over the autumn," they added.

"This doesn't mean it can't come back in 2024, and ITV have plans for other specials like The Masked Singer I'm A Celeb show."

www.thesun.co.uk 

Was The Masked Dancer ever hugely popular as that article suggests? It did ok but was never hugely popular. Tabloids just can’t resist exaggerating everything,