The law doesn't apply on normal people or an lemmy instance managed by German admins. It target only organizations or project receiving funding from German government.
The Bundestag reaffirms its decision to ensure that no organizations or projects that spread antisemitism, question Israel's right to exist, call for a boycott of Israel or actively support the Boycott, Divestment, Sanctions (BDS) movement receive financial support."
https://www.dw.com/en/germany-passes-controversial-antisemitism-resolution/a-70715643
I have been trying to find an instance for long time all either have registration completely shut down and others open for regiatration but admins don't accept my request