Question about switching the main APT

I live in Israel and the main APT is painfully slow when downloading / updating.
I have switched my APT to the Germany now listed in the url
Is it okay to remove the default APT?
Can it cause any security issues?
Right now i have only left:
deb rolling main contrib non-free
In the file:
Is it ok?

no that will not create a problem, it the server has ssl issues it will try to redirect to another suitable server no problem in that

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