Uhm no. For something to be a statement, or at least a meaningful statement it has to be distinguishable. If it fails to be distinguishable it's meaningless.
Because there is a third option(blank vote) you cannot reasonably claim to care if you are too lazy to go out and use that option to show that you find neither of the two candidates appealing.
Thus it's not my opinion but an objective fact, because as there explicitly exists an option for showing that you care but find either opponent unappealing. So not using using that option means you're too lazy to bother to go vote, and therefore not standing up and voicing your opinion that you find none of the candidates to be appealing. Unless of course you're willing but unable to go vote but with mail votes and early votes etc that's increasingly less of a plausible reason.
Now if voting blank wasn't an option(as for example there doesn't seem to be(to my knowledge) in the US presidential election) then not voting of course becomes more of a statement.