I know of no other ancient Egyptian samples to test so I decided to look at modern Egyptians. They have small amounts of steppe admix too, but the surprising part is it's apparently not all mediated through Greeks.

Of course, some Egyptians have detectable Mycenaean admix as expected, but these Coptic samples do not. Vahaduo still prefers to model their steppe admix through Yamnaya.

Conclusion? The steppe admix contributors to ancient Egypt had a large enough population to spread their genes around such that traces of their ancestry still persist in modern Egyptians. It's unlikely that singular random outliers could preserve a sign of their legacy, so I expect that there were more at some place and time. (Note that I am not saying that whoever these people were, they must have had high steppe admix.)