I had a look, because I was curious. This is searching within the UK. The first few quilting shop websites I looked at had it listed correctly, but then I got to this one, which calls it 100% cotton and does not mention the word "scrim", though they vaguely refer to it. They have photos of the packaging, which does not mention the scrim in any way, and does say "100% cotton".
https://www.1stforfabrics.co.uk/prod...ting-125-wide/
Is this the same product? As far as I know, the different one which is actually 100% cotton is called Warm 100, right?
Same with this shop, which specialises in batting, no less.
https://morrisworks.co.uk/products/90-warm-natural-wadding-by-the-metre.html
And this one seems to be in the US.
https://www.thequiltstore.com/shop/c/p/Batting-Warm-and-Natural-100-cotton-62-wide-x62022975.htm
So yes, there absolutely are shops selling it as 100% cotton, sometimes with close-up photos of the packaging, and the packaging does not indicate anything different.