Discrepancy between NVD list and available snort rules for Rockwell equipment..

We have a concern from an end customer who uses a lot of Rockwell equipment..

They used this tool:
https://www.snort.org/rule_docs?utf8=%E2%9C%93&search_type=standard&simple_search%5Bsid_or_explanation_or_message_or_cves_cve_key_i_cont%5D=rockwell&submit_rule_search=
And found 34 rules matching Rockwell.

Then, they used this tool:

https://nvd.nist.gov/vuln/search/results?form_type=Advanced&results_type=overview&query=rockwell&search_type=all&isCpeNameSearch=false&cvss_version=3&cvss_v3_severity=CRITICAL

And found 42 Critical and 71 High vulnerabilities.

They want to know what explains this discrepancy.

Is there an explanation why all 42 critical Rockwell vulns are not included in the existing snort rule sets?

Many thanks and kind regards
Steve

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