1

I did self leveling concrete in my basement as below

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But some spots showing small holes, potentially from popped bubbles

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And some have little pieces like chunks not mixed well

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I plan to install underlayment and engineered hardwood floor.

Is this a concern?

2

I just did my concrete floor for vinyl plank, and I would be concerned more for the flatness the the floor that it is within the tolerances needed. The bumps can be scraped off, at worst ground off. When I poured mine, I had high spots that needed ground down, quite the dusty job. The holes in the mix from the air bubbles will be of no concern, the flooring will span over them with no problem.

You may also find that the lumps are just unpopped air bubbles.

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