The record low attendance (*) was much lower.
Fylde vs Salford City, 2019 at Wembley - 8,049.
And 23,000 is not a particularly low crowd for the NL Playoff Final.
Boreham Wood vs Tranmere Rovers, 2018 - 16,306.
And in 2011 a certain Luton Town lost to Wimbledon in front of 18,195.
There...