What this video covers
The clip covers the one specification that decides whether a purifier does anything for mold spores.
It has to be true HEPA. HEPA-type, HEPA-like and similar wording are marketing terms for filters that do not meet the standard, and the distinction is deliberately easy to miss on packaging.
The takeaway
Read the filter specification rather than the front of the box. If it does not say true HEPA, assume it is not, because a compliant product will state it plainly.
Read the full written guide: True HEPA vs HEPA-Type for Mold.