Problem with apt update

["Stephen P. Molnar" <s.molnar@sbcglobal.net>]

I have just reinstalled Buster on my main computer.

While I was setting up my desktop I ran:

    sudo -s dpkg --add-architecture i386

without any warning or error messages.

I know the the command worked because I can access -i386 applications. 
However, when I run:

> comp@AbNormal:~$ sudo -s apt update
> Hit:1 http://mirror.cc.columbia.edu/debian buster InRelease
> Hit:2 http://mirror.cc.columbia.edu/debian buster-updates InRelease
> Ign:3 http://dl.google.com/linux/earth/deb stable InRelease
> Hit:4 http://dl.google.com/linux/earth/deb stable Release
> Hit:5 http://security.debian.org/debian-security buster/updates InRelease
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> All packages are up to date.
> N: Skipping acquire of configured file 'main/binary-i386/Packages' as 
> repository 'http://dl.google.com/linux/earth/deb stable InRelease' 
> doesn't support architecture 'i386'

none of the Debian i386 repositories are listed. Why is this the case?

Thanks in advance.

--
Stephen P. Molnar, Ph.D.
www.molecular-modeling.net
614.312.7528 (c)
Skype:  smolnar1