https://learnmeabitcoin.com/technical/locktime

Apparently, with a lock time of 542,824,020, your transaction was "locked" until some time in Sunday, 15 March 1987

It was never truly locked. Maybe someone was testing, or maybe someone is using that field in a non standard way.

The lock time comparison table at the bottom makes no sense. Since when did 0xede80600 = 452845 in decimal ????