Mac internal storage

If, after doing what Ronasara mentioned you still don't see the freed up space reindex the drive according to this Apple document: How to rebuild the Spotlight index on your Mac - Apple Support  

The data can still be contained within any hidden APFS snapshots as well until those snapshots are deleted. Time Machine and other backup software now utilize these APFS snapshots. Normally these snapshots are deleted automatically after a short time once the backup has been completely transferred to external media, but maybe one of them may remain longer. You can check if there are any APFS snapshots by using this Apple article:

View APFS snapshots in Disk Utility on Mac - Apple Support

In addition to what has been said already: select the drive and press Command-I to open the Info window.

What does it say, specifically about "available" and "purgeable" space? It is quite possible that a lot of that space is kept as "purgeable" - a nuisance that the last few versions of macOS have impinged on users. The space should be freed as needed, but it not always is, or not speedily enough.

M0ndayTuesday wrote:

I appear to have some 420Gb in 7 AFPS Snapshots......

That's very relevant. Where are you seeing this (Disk Utility?) and are these from Time Machine, or from another program (possibly Carbon Copy Cloner)?

Please confirm that you then deleted that moved data and then emptied the Trash.

In addition, there is that 70+GB "purgeable".