I agree. I mean, it would be very damaging.
However, I don't think it would actually get to declaration of article 5. The way this works is that a country comes to council and says their homeland has been attacked from abroad and here's the evidence. They then ask that the alliance declare article 5.
To declare article 5, you need the agreement of all 28 allies. I think in this specific instance, some allies would say that this is not an article 5 event and they are not going to therefore permit NATO to declare article 5. I think the thing would kind of grind to a halt before article 5 was declared.
Article 5 is not automatic just on the basis of an attack. It needs to be agreed to by all 28 allies.