I dont actually think thats true anymore.

But even using Fedora Chromium, with like all policy switches set to degoogle, Googles removed as search engine, no online Account, Chromium still pings Google when

• choosing Accounts (all offline)
• loading the installed (!) Addons
• going to settings
• viewing the password manager (with everything GUI for Password checking etc disabled)

I ran googerteller to check that

sudo dnf install gcc make 
git clone https://github.com/berthubert/googerteller.git
cd googerteller
cmake .
make
sudo tcpdump -nql | ./teller