Obieone - I do not think so although, of course we will not know.
What he seemed to be explaining is really what a financial advisor would explain. You think this investment (leaving the EU) is interesting and would like to give it a go but are you prepared to lose what (he calculated) you may lose by doing it. Obviously he knows you may or may not but as a risk averse person (i.e., someone who cannot afford the loss and isn't prepared to gamble) he has decided that he is not sufficiently sure of the upside that may be possible to risk the downside that may also be possible.
That seemed one of the most reasonable assessments I have heard and, I would assess, typical of someone assessing financial risk. He is not saying that anything is certain which both sides keep doing so annoyingly, because, as he says at the beginning of the article - there are no facts, most of it is calculation. His calculations lead to him thinking there is a greater financial risk in coming out than staying in and his assessment of what we would gain (for him - he is not saying it is for anyone else) does not outweigh the risk. 