What ever the cause of the delays, it is the reaction of one traveller to these delays, and the cause he attributed it to.
I doubt the EU will be wringing their whithers if border controls choke off a few visitors from the UK, their tourist industry is so large and so many tourists are from other EU countries and from non-EU countries, they will find they can manage very well without us. The majority will still travel there anyway. We are not going to sell our house in France because we are no longer members of the EU, nor will most Brits with holiday homes in the EU.
So many Brexit supporters really overestimate our importance to ordinary everyday EU activities.