質問
説明では削除になっているが、実際はAPIバージョンの数字の置き換え
The description in this trail is still confusing in 2023 ("...remove the package version ...").
The correct create() URL goes like:
https://yourDomainName.trailblaze.my.salesforce.com/services/Soap/c/XX.X
with XX.X being the current SOAP Version you installed or are using along with the SOAP UI App so it's not removing, but replacing.