If the scratches are very light, since the matte protector does diffuse light a bit, it will hide some of it. Welcome. It will tend to hide it a little, but for the scratches to be rendered invisible, the protector would have to be applied with a layer of adhesive of the same refractive index as the glass.
Can you put a screen protector over scratches?
Cover Scratches With a Screen Protector
If you don't want to risk damaging your screen by using the above methods and you'd rather not spend the cash on having it professionally repaired, you can always cover scratches using a screen protector.
Are matte screen protectors better?
If you do a lot of outdoor device viewing, a matte screen protector is the way to go. However, if you're mostly indoors and value the most accurate color and brightness rendering, stick with a glossy protector, as it will most closely replicate what your screen looks like without a covering.