Where do you see that? Just that the vast majority of non-observant are not, not that there's no such thing.
Besides, the question was about a mechalel shabbos iinm.
Read the screenshot I posted.
The Chazon Ash says Mechalel Shabbos is not considered Mumar etc until he does so in the face of תוכחה, and since there is no תוכחה nowadays
all are anusim.
That may not be the prevailing opinion but there is no question it is what the Chazon Ish says.
Then there's no real question he's a tinok shenishboh.
R Elyashiv and others dispute that, since knoweldge of Shabbos is fairly widespread.