If I understand correctly, this just enables Odoo to read and work with GS1 barcodes, but doesn't enable the GS1 code generation within Odoo?

I looked at the code for print Lot numbers PDF - see part of extract below.
It looks to me that i say: If user have Group 'Print GS1 Barcodes for Lot & Serial Numbers' and product barcode is valid GTIN, print GS1 barcode.

t-att-style="barcode_index >= len(page_docs) and 'visibility:hidden'">
<div t-att-style="'position:relative; width:43mm; height:19mm; border: 1px solid %s;' % (o.env.user.company_id.primary_color or 'black')">
<t t-set="final_barcode" t-value="''"/>
<t t-if="env.user.has_group('stock.group_stock_lot_print_gs1')">
<t t-if="o.product_id.valid_ean" t-set="final_barcode" t-value="'01' + '0' * (14 - len(o.product_id.barcode)) + o.product_id.barcode"/>
<t name="gs1_datamatrix_lot" t-if="o.product_id.tracking == 'lot'" t-set="final_barcode" t-value="(final_barcode or '') + '10' + o.name"/>
<t t-elif="o.product_id.tracking == 'serial'" t-set="final_barcode" t-value="(final_barcode or '') + '21' + o.name"/>
</t>
<div class="o_label_4x12" t-field="o.product_id.display_name" t-att-style="'width:22mm' if final_barcode else ''"/>
<div class="o_label_4x12" name="lot_name" t-field="o.name" t-att-style="'width:22mm' if final_barcode else ''"/>
<t t-if="env.user.has_group('stock.group_stock_lot_print_gs1')">
<div t-if="final_barcode" t-att-style="'position:absolute; right:.5px; bottom:.5px'" t-out="final_barcode" t-options="{'widget': 'barcode', 'symbology': 'ECC200DataMatrix', 'img_style': 'width:17mm; height:17mm'}"/>
</t>
<t t-else="">
<div t-field="o.name" t-options="{'widget': 'barcode', 'img_style': 'width:100%; height:35%'}"/>
</t>