That article is a little out of date, though, PP. The fall in Sterling hasn't been reversed (although so far this week things are on the up), but the stock markets at least have been generally growing after the initial huge falls.
The main problem, though, is that while "the economy hasn't collapsed", that is at least in part because Brexit hasn't led to any material changes yet. No policies have been announced; no negotiations have started; no new trade deals have been established; and Article 50 has not been triggered. What the effect of these will be remains uncertain -- and besides, the Stock Markets pay heed to many other factors. It's been suggested that the Stock Market recovery (and then increase) is anyway a serious overestimation of the actual value of shares, so we may be headed for a (not Brexit related) crash at some point once people start realising this.
At any rate, the indications are mixed, and are likely to remain so until, at the very least, we get told what "Brexit means Brexit" means.