Ahhh, figured it out! I do have one area in the file where the version was still hard coded and it was set at 4.0. That explains where you see 4.0 and not 4.1 on the Templates page. You do indeed have 4.1 installed. If you want it to show 4.1 on the Templates admin page, just redownload and reinstall it.
The video is of a feature preview for Connections 8.4 the current version is 8.3.3. cMap will not get Customizer support until version 5.0. My plan is to release 8.4 this Friday and start releasing updates to templates the following week.
Hope that helps… apologies for the trouble and confusion!