We don't know that without the full picture. Only FDEV knows that. I presume that currently it is the case indeed, but I wouldn't say it can't be denied. FDEV could potentially deny that with a hard proof, but they never shared player numbers and similar data.
Steam stats, which I agree only show those users using steam accounts, are showing steam player numbers lower than every over the past year. That! cannot be denied.
But maybe Fdev want us to beleive that there are more non steam players that bought the expansion and none of them left. Or maybe they want us to beleive that all the new SC players from Elite (Many I see every night) are fictional, or that that number has increased since the DLC debacle is just hapenstance?
They can 'potentially deny' all they like, and who will beleive them?