Logistics not really much better because you need visas, which the UK govt is now in the process of restricting, unless you're Irish. Access to capital is arguably better than Europe but not better than the US. I guess it could be an option if you want physical proximity to Europe or if you make physical goods for the European market because the UK still has a 0 tariff agreement with the EU.
I think it means literally nothing for start-ups. It's just a slightly better than expected economic result for one quarter.
As a founder, my experience is that the US is a much easier place to raise capital than the UK or Europe. But your experience is going to vary based on the kind of business you are in and where your customers are located.
I think really it means not that much - if you want to start a startup then really you need to think about access to capital and the US is still far ahead there (and growth figures like these don't really change the game.)