No it doesn’t. The comment’s syntax is correct. Commas before “which,” and not before “that.” https://www.dictionary.com/e/that-vs-which/# https://www.diction

No it doesn’t. The comment’s syntax is correct. Commas before “which,” and not before “that.” https://www.dictionary.com/e/that-vs-which/# https://www.dictionary.com/e/that-vs-which/# The actual problem is the usage of “which.” If they’re Blueair purifiers that happen to not have HEPA filters, they should have made the clause essential/restrictive. If all Blueair filters lack a HEPA filter, then adding that they don’t have HEPA filters as clarification is non-essential. So I understand your confusion, it’s just not for the reason you said it was.