15 tall boys for a few mine cleares... they cost a bundle. Nah it were the pens.
Kriegsmarine had still some goodies there that could be trouble.
But it does not alter the fact very heavy costly bombs were dropped.
Now. Why would they dropped it on a target a worth while as a flea? A mine sweaper?
Ijmuiden because of its harbour and hoogovens ( high quality iron ) was a big target and heavily defended.
Also the schnellboat bunkers.
That was the target Schnellbootbunker 2.
And i am not sure tall boys were used.
Edit. See source 3
Overzicht van bombardementen op IJmuiden en omgeving Datum Plaats Omgeving Uitvoering Slachtoffe...
www.bunkerinfo.nl
The bunker.
Schnellbootbunker 2
Deze site herbergt kennis over militaire, maatschappelijke en landschappelijke aspecten van de Atlantikwall in de periode tijdens en na de Tweede Wereldoorlog.
www.atlantikwallplatform.eu