Are filenames likely to include those representations? I feel like probably not (can you even include commas in Windows filenames?)
More to the point of the article--if you want things sorted by date, sort by date. I think most laypeople aren't looking at long CHAR1234_5678 filenames anyway, they're looking at thumbnails and dates.
The most common date format used in Europe uses period separators so can often appear in filenames. Commas are probably more rare. Things like versions are often fractional like v1.3 or v1.11 and can appear embedded in filenames.
> can you even include commas in Windows filenames?
Yes.
> Use any character in the current code page for a name, including Unicode characters and characters in the extended character set (128–255), except for the following:
The following reserved characters:
