Earlier quoted context omitted.
No, you are arguing in bad faith (or ignorance). British immigration policy is British immigration policy because as per European law it has mechanisms to prevent benefit immigration that is isn’t exercising https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:... The fact is successive governments have rightly identified that both skilled and cheap labour from immigration is keeping our economy afloat. Otherw…
The EU Commission's position, if I remember correctly, is that all those mechanisms cease to apply as soon as the person gets so much as one temporary job of any length within the country they're moving to and that the host country must give them full benefits entitlement from that point forward.
The only problem in preventing illegal immigration since internal border checks are reduced, but UK cash have the border restored to higher scrutiny without running afoul of Schengen.
What the Brexit move actually does is prevent influx of Polish, Czech, Greek, Spanish, Italian etc. citizens into UK... Move of German immigrants into UK is almost certainly of no concern.