[ouid]

It's not an opinion, it's a conjecture. Opinions are emotional responses to facts, not arguments about their veracity.

Examples of opinions include:

The color red is beautiful. I'm sad that sharks are being hunted. I hate poor people.

None of the following are opinions:

This rose is red. My landlord poisoned my dog. Poor people do more drugs than rich people.

In particular, a statement is not an opinion simply because it is presented without evidence. It is only an opinion if it can't possess any in the first place.