Overtornea Family History

Why don't I find any geni-links to the mentioned profiles? This is Geni anyway...

I am not sure what you mean? Do you mean the format of the links? I am new to Geni. I just use direct URLs.

Is there a website for Finnish records like the sok.riksarkivet and digitalarkivet.no sites please?

This is free
http://en-dot-digihakemisto.appspot.com/
Cost money
https://www.sukuhistoria.fi/sshy/index_eng.htm
Hiski
http://hiski.genealogia.fi/hiski?se

https://arkisto.fi/en/records-3/records-2