We saw them 'review' this only recently...
Considering in the IR35 'consultation' they were warned from all sides what the consequences would be. Places would simply blanket ban contractors for fear of getting IR35 determinations wrong. We saw this in the public sector where many many projects collapsed due to exodus of workers.
What was the result? That IR35 was 'working' in public sector (it wasn't), there was 'no evidence' for blanket IR35 determinations (there was, and subsequently were ahead of private sector too).
Considering they completely ignored everything that happened when it was brought in the public sector and ignored all the advice about what would happen, the consultation was a massive joke in favour of simply driving IR35 forward. Seeing as we've seen them demonstrate completely ignoring the facts, any such 'review' they promise will be the exact same box-ticking exercise to drive it forward they already did in recent months.
No sane person could believe that the tories would do anything to change course, as they'd have to admit their very recent 'consultation' was all smoke and mirrors and was flawed.