Yes, I read the article.

Most welding glass will not be #14 or #13. If it's meant for stick welding, it'll be [Edit to add, #7 was still common when I was welding stick, but is not recommended even for that, it was old-timers who were used to 6011 rods] #9 or #10 at the darkest, far too light. If for MIG it will be darker, #11-13; I set my shield to #11. TIG glass will be the darkest, and ideal.

Oxyacetylene cutting masks will be between a #4 and #6. Don't watch the eclipse with those. Plenty of people will though.

Sunglasses, for reference, are typically going to be between a #1 and #3 shade. Definitely don't stare at the sun through those