Generative AI on Vertex AI locations

[BernardC]

Hi 

I am trying to fully understand where processing takes place using gemini models when a particular location is selected. I need my data to be resident in the UK and I want to use Gen AI, so I will choose the europe-west2 region which is in London.  This much is clear to me based on the link below

Generative AI on Vertex AI locations  |  Google Cloud

However, what is not clear to me is what the section in the screenshot below means:

It reads :

Important: Machine learning (ML) processing for gemini-1.0-pro-001, gemini-1.0-pro-002, gemini-1.0-pro-vision-001, imagegeneration@005, and all available Anthropic Claude models occurs within the US when requests are made to regionally-available APIs in the US, or within the EU when requests are made to regionally-available APIs in Europe.

My questions are what is "Machine learning (ML) processing" mean in this context is it all requests made to Gemini or just a subset of them or something else? If in my AP call I specify "europe-west2" does this mean that my request will be or may be processed in a different European region. The UK is not within the EU

Thanks