Haven't heard of them before, so I'm going in cold here. It seems to me that they provide an instant payment layer, in the same vein as Osko/PayID. Their website is pretty low on technical detail, but they appear to operate firmly as third party service - as opposed to ISX, who are set up to operate as a complete (neo)bank.
I don't get a whiff of any KYC innovation or AML focus. On the flipside, I don't see instant payments as part of the core marketing push for ISX. So I don't think we're looking at a direct competitor here. Like you I am happy to be further informed by the next poster