They are turning them off, but not removing them from the network, so it may still be possible to specify certain proxies. But as the post has said it is asking people to remove any specified proxies in their browser for when they turn them off completely.
Quote:
So that this does not cause any potential loss of service (we're still
working on the switchoff plans), we request that you remove a cache if
you have it manually set in your browser.
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