Some of the uploads were of completely original "new" music videos, that matched previously unused / underused archive footage with classic Bowie tracks. Other videos were of live footage re-soundtracked with official live audio tracks. And others were simply attempts to restore or expand existing classic videos, using the latest digital editing technology.
It's difficult to say how many of Nacho's Bowie videos have been uploaded to date, partly because of the numerous different channels and platforms he inhabits and those of others that share his work. But also, despite Nacho's continuous struggle to comply with / circumvent copyright restrictions, videos regularly get blocked and removed. Some of the removed videos remain offline, but may reappear later in revised form, on platforms that are less strictly policed.
Here is an attempt to collate in one place, as many of Nacho's currently online Bowie videos as possible.