Yes, and its probably worth a little analysis and rebuttal... since while plausible, and in most places at least based on (partial) truths, it does seem to be pushing an agenda (daily wail - never!).
Firstly, the initial point about breakdowns from freezing condensate drains is entirely the fault of BG and their ilk ignoring the manufacturers instructions for the protection of the condensate drain. Read any of the manuals, and they are usually most explicit about how one should route and protect the drain from freezing. Many of these boilers were fitted in attic spaces and the condensate drain run through small diameter pipe in unheated spaces - set to discharge into gutter or onto a roof surface etc.
The part about return temperatures is also partly true - you do get the better gains in efficiency at lower return temperatures. And indeed if installing a system from new, one would tend toward higher output rads to allow this efficiency gain to work for as much of the year as possible. However it is ignoring other relevant information. Firstly modern boilers are modulating. They will adapt their output to match the demand and don't need to run flat out all the time. This enables them to maintain condensing efficiency gains for much longer periods of the year, even where the rads are undersized. Secondly, even at higher return temperatures, you still get better efficiency from the HE since with a conventional boiler the HE needed to be limited in size so as to prevent the possibility of condensation as much as possible.
With regard to condensate corroding the boiler, yes on older designs adapted from non condensers by adding secondary condensers it was a problem. On modern designs with ali and stainless HEs, and down or radial firing burners etc it does not seem to be an issue.
The point about the economic sense in scrapping a working boiler however is valid. You are unlikely to recoup the cost unless you have a high gas bill in the first place. This however does not seem to be a relevant criticism of the technology itself.
The £2000 for "one of the better ones" claim is out by a factor of 2 really - although that article is a few years old now.
Lastly people are very fond of comparing cast iron lump boilers with natural draught flues to a modern condenser, which is the wrong comparison since the cast iron lump boiler is not the predecessor of the condenser, and not the boiler you could have bought as an alternative anyway. One ought to be making comparisons with other modern forced induction boilers stuffed full of electronics etc.