I would use it. It looks like grass, that would help continue the composting. You'll be scraping off the sticks and grass, then scraping up the good stuff, or maybe
sifting them out.
If you rake off the grass and sticks, and find well rotted stuff under, that could go straight onto/in a garden, with mulch on top to keep weed seed from growing.
But yes, anytime you scrape up soil or in this case years of fallen leaves on top of original soil, you'll have weed seeds there.
It won't get to 150 degrees without a lot of help- many people don't get there with casual composting.
I guess we have our individual tolerances of weeds and views of how best manage compost.
