Even if they did it will simply be a short lived bump unless the product and service is measurably better. If it is then in the long run it shouldn't matter either way.

However, I do think their criticisms of Zendesk and their paid blogger's method of product 'evangelism' are fair and they have every right to take their shot and fire back a bit. It's all good, the better product development team will most likely win either way.