Is this scab on my apple leaf?

Anyone knows what makes this leaf look like this? Many of my apple leaves are looking the same, and are falling off the trees.

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From the damage and the timing of it, my bet is on Marrsonina Leaf Blotch. Check this out.

https://blogs.cornell.edu/acimoviclab/2018/09/24/marssonina-leaf-blotch-causes-apple-leaf-defoliation-where-cover-sprays-were-stretched-in-summer-2018/

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I ran across this video today on my phone. Is anyone familiar with adding cobalt to scab sensitive apples?

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