Article 5 was not invoked by the US as a consequence of 9/11, it was NATO themselves who deemed the attack as qualifying to activate a casus foederis, and none of the actions taken as consequence by NATO were related to the attack in Afghanistan (the first having been ISAF 2003).
https://twitter.com/HenryJFoy/status/1479134484905746441
That Washington called for Art V is one of the greatest persistent misunderstandings of what actually happened back in 2001. The entire point of invoking Art V was to "show solidarity" with the US, by the Alliance. Cynics might suggest it was an effort to show relevance. 
The eight measures that were decided in October 2001 were designed to deter further attacks on the US in general, not focusing on Afghanistan. Enduring Freedom was in principle a US-British led operation & other NATO partners (esp GER) were quite keen on distinctions to NATO-ops.
Source for above of course NATO page:
nato.int/cps/en/natohq/…
nato.int/cps/en/natohq/…
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