I believe it still holds true. Since its deprecated, from next major version onward, there would no external PSC. But till then and in current 6.7, external PSCs are there and will be used. Hence, its being shown as an option and you do have a choice to deploy whatever model you deem fit for your environment.
You're right. But I think that diagram shoud then include the other options like "setup esxi -> deploy or install vcenter server with an embedded platform sevices controller -> deploy or install aditional vcenter server with an embedded platform sevices controller"
I said this because in vsphere 6.5 this topology (2 vcenters with embedded psc joined in linked mode) was not recomended and since 6.7 this is the recomended one. I think this sould be stated in this page.