They see the dissent growing in the USA so they are pretending like they want to do something.
I don't think that's the most relevant audience to the ICC.
The most relevant audience to the ICC is the United States government, which (Congress, the judiciary, the Presidency) is staunchly pro-Israel and has threatened to sanction ICC officials/prosecutors. Consent can be manufactured and is continually manufactured by the US media, despite discontent (largely within the Democratic party's youth wing).
If you had said the intended audience is the wider global community, particularly in the Global South, that is more plausible. As the ICC has been accused of bias in terms of its prosecution for over a decade.