What makes you think that frame looks like pentile?
You cant see the subpixels at all.
EDIT: I guess you mean because they seem to alternate?
It might be dithering though, can't really tell from the low quality picture.
Pentile I think usually has more overlap between rows.
If you look at the white part, you can't really draw a straight line between rows, you need to cut some pixels in half.
( the white parts have all the subpixels turned on and the pixels in the frame are also almost white )