The post you are reporting:
I assume they left the Labour Party because fundamentally they're not socialists and, as several of them have connections with the SMF, they appear to have more in common with Blair-Brown and the wet wing of the Conservative Party. Of course, they should seek re-election, as any representative should who leaves the political party whose platform he or she was elected on. They won't, of course, as they're essentially no different from the others in believing that they own their seat, never mind that they've disenfranchised their electorate.
As far as money is concerned, as the seven are not a political party but 'supported' by a limited company (established 16 January 2019, one director: Gavin Shuker) they aren't required to disclose any sources of income. The Secret Seven, perhaps? What an adventure this could turn out to be. But given that a couple of them were on the Telegraph's radar during its investigation into MP's expenses, I doubt they'll have any problems raising finance.