This is true, but since the two companies are an affiliated service group, they must be considered a single employer for coverage testing. The NHCEs in Business 1 are not benefiting in the match/after-tax portion of the plan so the NHCE coverage ratio is zero and therefore the coverage test will fail.
If the money left the plan and went to rollover IRAs, someone needs to generate a 1099.
Who did the 1099s for all the rest of the participants? They would likely do these 6 as well.
I've been an ASPPA member since 1989 and I'm very partial to them. I've been active in a lot of different areas. I was also a NIPA member from 1990 through 2022. Never felt I got as much from it.