* that the false positive rate is going to result in more legal material being taken down than ISIS propaganda by an order of magnitude even if what they claim is true.
* That the success rate on the data set you've been training on is highly likely to completely mis-represent your true success rate.
* That the processing power required for this is likely prohibitive. Not capable of being run real-time, and any actual implementation will have much worse results due to performance optimization.
That's laying aside the deep and obvious problems with the government forcing private companies to censor legal speech with no over-sight or even a human in the loop. Let alone law enforcement in the loop.
What this press release is, is a calculated attack on free speech. Deliberately misleading the public about the capabilities of technology to attack the technology companies they claim to want to work with. To apply public pressure to private companies to do police enforcement jobs.
The only response to this is to state the obvious: If the government wants something censored they can apply to a court injunction as is due process, and in the mean time, let's get rid of this abhorrent stream of Home Secretaries.