I am friend of Tim Hutchings, but this time I can't agree with him, not because Florence Kiptagat is a my athlete, but because there is no any analysis in what he wrote.
The fact the improvement was so big doesn't mean something was wrong in the race.
In 1965, Ron Clarke improved is WR of 10000m (without any pacer) from 28:15 to 27:39, and 36.0 in 10000m are equivalent to 1:15 in HM : somebody can suppose the track was shorter ?
In 1968 Bob Beamon improved the WR of long jump from 8.35 to 8.90 : somebody supposed the meter was too short ?
Great performances are blessed by particular situations of perfect conditions (shape of the athlete, weather, in case of road races type of course and quality of tarmac, pacers, mental tranquillity, etc...), that can allow athletes to achieve performances of unbelievable level.
Barcelona was one of these opportunities.
The fact she ran only 4:20 slower than Eliud Kipchoge (winner in 60:52) and was number 4 in the full race, defeating all the Spanish male runners, can explain enough the ecceptionality of the performance, without having any doubt.
Tim normally is able to analyse the development of a race for having nice technical explanations.
In this case, he was superficial and spoke without knowing any thing, putting in the mind of people the seed of doubt, that is the worst thing for a commentator.