Do not assume that the drains are the only identification that the anti-entrapment safety feature is not in place. Devices can also be installed in the pump room as well. If you do not know recommend a CPO specialist, don’t act like one.
This is why Realtors hate to deal with “Deal Killers”…bad inspection reports.
Commercial pools have permits, the Board of Health will not reissue a permit till the pool meets the new code. Again the older drains are not a way to ID the issue. The retrofit system is about $1,500 and installing drain cover with a two drain system is thousands more… these covers expire in 5 years from install date (recorded with Health Dept). When inspecting these pools you will need county records.