Can not delete Snapshots using Apple instrutions

This MacWorld describes how to use simple Terminal commands to remove local snapshots: How to delete Time Machine snapshots on your Mac

It's very easy just copy and paste the commands into Terminal.

I've tried the Apple method like you and was unsuccessful.

UnitaMan wrote:

How can I remove these pesky snapshots without a deep journey into Terminal programming?

And how are TM snapshots pesky—they play a vital role in your ability to recover.

Time Machine does well in managing itself.

About Time Machine local snapshots - Apple Support

What is the bigger issue here?

3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.

Purging local backups

Please note that although this doesn't affect your remote backup from Time Machine, this will get rid of the redundancy (at least until the next Time Machine backup) that a local backup disk will provide. If you need such redundancy or are worried about the recovery of your data then you would be best served to let macOS determine when to purge these files.

Start Terminal from spotlight.

At the terminal type tmutil listlocalsnapshotdates.

Hit enter.

Here, you'll now see a list of all of the locally stored Time Machine backup snapshots stored on your disk.

Next you can remove the snapshots based on their date. I prefer to delete them one at at time. Once my "System" disk usage is at an acceptable level, I stop deleting but you can delete all of them if you want to reclaim all of the disk space.

Back at the terminal, type tmutil deletelocalsnapshots YYYY-MM-DD-HHMMSS , where will be one of the dates from your backup. This will be in the form of xxx-yy-zz-abcdef. Try to start with the oldest snapshot.

Hit enter.

Repeat for as many snapshot dates as required

http://www.thagomizer.com/blog/2018/03/27/cleaning-up-time-machine-local-snapshots.html