It's hard to say anything about a paper unless we can look at the data... not saying it's also true here, but I remember the controversy over the gravitational waves observation claim and how it turned out to be noise from cosmic dust, lol.
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well there is some data in the paper, and as this is an accelerator experiment things are much better controlled than in astronomy, but indeed the gravitational polarisation of the BICEP2 experiment also included a difficult background (dust that time) that they had difficulty modelling well
and in this field, like most of physics, all papers are made public as preprints, you can take a look yourself here: https://arxiv.org/abs/1805.12028
I understand... very few of these words.
well it is a scientific paper... but the data is there :)