For sigpatches to work properly, you need to pair them with the appropriate version of Atmosphere and firmware.
You're currently on 16.0.2|AMS 1.6.2 while the latest sigpatches in the first post of this thread are for 17.0.0|AMS 1.6.2.
If you really want to stay on that version of firmware, check
this tutorial to see how to create your own sigpatches.
Since you're starting out with a fresh emuMMC, I'd suggest updating your emuMMC firmware to the current latest (i.e. 17.0.0) via Daybreak. Firmware files can be found easily by a quick Google search, just extract them to a folder on your microSD card, name doesn't matter as long as you can easily find it.
Firmware 17.0.0 had some major updates (check
this post to learn more) so in case you ever cleared your prodinfo in order to avoid getting banned by Nintendo, you'll need to undo it and set up
DNS MITM or similar instead in order to connect to the Internet (to update your homebrew and alike).