Sentence examples for this is not one from inspiring English sources

"This is not one million dollars on day one.

This is not one.

"This is not one government".

This is not one of those films.

This is not one of those circumstances.

So this is not one for the risk-averse.

But this isn't one.

This isn't one for toddlers.

This isn't one of those crises.

This isn't one of those times".

This isn't one for me or my schoolkids.