According to some articles from BAIDU.com, lots of users do updated deepin v20 from v15, quite different architectures to some degree, but not using a single bash-command line other than that as below:

first of all, have to change the source:

sudo vi /etc/apt/source.list

deb [by-hash=force] https://community-packages.deepin.com/deepin/ apricot main contrib non-free

using # to comment out previous source

and then,

sudo apt-get update

sudo apt-get dist-upgrade -y

finally, other in terminal or desktop evironment, you can see that you have updated to v20.

BUT, THE KERNEL IS STILL NOT UPGRADED!!!!!

so, i think you can take a try where release, and see what if...

The team has developed a tool which helps upgrade from 20.9 to 23 Beta, but many users reported problems with it. Maybe it will be improved after 23 stable releases.

Of course it is possible but it will be risky because Deepin 23 version connections game received many negative reviews from those who have experienced it.