The Article 5 wording is vague. It states that an attack against one member “shall be considered an attack against them all.” What is quoted less often is that each member state only has an obligation to take “such action as it deems necessary, including the use of armed force.”
In other words, Article 5 does not commit member states to deploy military assets if an ally is attacked. It only commits them to some form of response.
Maybe you’ll believe the Center for European Policy Analysis
But, what do they know anyways?