Ask HN: How is LinkedIn pulling in contacts from an unlinked email account?

I found out a while ago that I had unwittingly given LinkedIn access to my Gmail account. I manually removed every single contact LI had auto-imported and deleted the email address from my LinkedIn profile.

However, I continue to receive suggestions for people who I have emailed with my now unlinked account. It's baffling me how LinkedIn is still pulling these in...

I haven't changed the password of my gmail account since disconnecting from LinkedIn, but surely LinkedIn won't store this password/continue to access the account?!