The UK government has been on something of an anti-judicial kick for the last year or so since the decision in Miller II/Cherry, the prorogations case (and a few other cases that haven't had as much press attention such as the Privacy International case on ouster clauses).
They've been talking about "reforming" or "scaling back" the Supreme Court—perhaps simply by renaming it—and talking about how judges have too much power, and are too "political", which somehow they propose to fix by replacing the independent appointment process with a more explicitly political one.
Also, if Johnson and the Conservatives wished to bring about the same result, they don't need a Supreme Court decision to do so—they have an 80 seat majority, a large chunk of which come from disaffected Labour voters in the so-called "Northern heartlands" who are perfectly happy to have employment rights improved. The Conservatives could, if they wished, quite easily pass primary legislation to specifically make gig economy or app-based workers have the status of workers under employment law - they'd probably get cross-party support for it.
See:
https://www.theguardian.com/law/2020/nov/15/supreme-court-pl...
https://www.lawgazette.co.uk/law/government-urged-to-rename-...