Understanding changes with Glacier Deep Archive

I've had a Storage GatewayVTL for a while and it's been great. We use Veeam as the backup application, FWIW.
I am now trying to figure out exactly what the changes are now with Glacier Deep Archive. In the past, my understanding was that anything uploaded to the VTL, by default, was stored in S3 (not S3 Glacier, regular $.023GB/month. If we wanted to move something into Glacier, we would either set the job in Veeam to automatically export the tape after the job completed, or manually export the tape later. I have done this many times, and those virtual tapes would show up in the AWS Storage Gateway console as "archived". And our bill would reflect that, as far as I could tell based on storage used etc.
Now, in the SG console, there is this new (I think it's new, I don't remember seeing it before) column for "Pool". There is still an "Archive" status column that my previously archive tapes still have a "Date archived" value that is consistent with past status.
I am finding that I can create new tapes and select which pool I want to put them in, but the only options are Glacier and Deep Archive, no regular S3.
This would seem to indicate that regular S3 is no longer part of the picture with a VTL, it's either Glacier or Deep Archive. However, the "updated" pricing for Storage Gateway still references S3 as part of the model.
Also, all of my tapes currently are listed under the "Pool" column as being in the "Glacier Pool".
I've not found anywhere the states how/if S3 is used for virtual tapes and was wondering if anyone could shed some light on it. Thanks!