Doping

The passport is a longitudinal system, so it builds a picture over time. Which means you can still use EPO, but you need to use it all year round and only micro dose with it. You also must have been using it from the start of being on the passport system. It's not infallible but it does mean you have to be very, very committed to beat it.

2015 called...

I've read the article properly now, and I'd say the way he went about it doesn't stand up to scientific analysis. We (and he) has no idea if he actually took EPO, given that he bought it online from an unspecified source and it wasn't legit. It could've been saline solution for all he knows, and the gains he claimed he saw could've come from a combination of the placebo effect and his modified training regime.

For the passport to be properly effective, it requires a duration longer than a few months. Look at the case of Jonathan Tiernan-Locke, it took over a year of him being regularly tested to confirm that he'd been doping when he joined the passport programme.