The Analytical Armadillo is a well known and well-respected breastfeeding counsellor who fully researches and references all her articles, so you can see for yourself whether what she writes is valid. Far more so than lazy journalists. How it compares to the researchers is that she explains how they got to their findings, and she also brings in other research that they have not included because they were cherry picking to create a news headline (but WHO and the NHS did). Note: this wasn't research, but a review of a limited amount of existing data instead of using all available data as was done to create the official guidelines.
When you look into the research properly, ignoring the newspapers, you find that it is true that in some cases milk only may not be sufficient for some babies to 6 months, and some babies are at risk of anaemia (etc) without supplement or complimentary foods before this point - but this was NOT news, and this was ALREADY part of the WHO and the NHS's guidelines. The babies in question are babies with specific problems - perhaps specific premature babies or babies with other special medical needs. These babies are already being dealt with by paediatricians and their parents know about their special needs. The research cited in the paper discusses this and this lead to the headlines. "Some babies may be at risk" worries parents that THEIR baby may be at risk, yet the at-risk babies were already being dealt with!!!
There is other research into the best time to introduce solids to limit the risk of allergies and the current research is very contradictory, so by taking one or two studies, as these guys did, you can make the case for the introduction of risky solids (eg wheat) at, say, 4 months - and equally by picking out other studies you could equally validly (or invalidly) say that parents should wait until 12 months before introducing wheat. So, rather than cherry picking studies as these guys did, the WHO and the NHS looked at all available research that we have at the moment, and made a decision based on the full amount of data. Research continues into this as we still don't have a really good understanding of it, so guidelines may change, but the guidelines really are the best we can do with what we have.
The point of posting AA's blog, though, is that it does give you the information that you need to make a decision because not only does it have her explanation of the news articles (which you can clearly argue is her opinion or interpretation), it also has the references which you can check out yourself to make a decision based on the science, not the lazy news articles, hence why it's an important link.