Are Eurosceptic Tories really ready to move against May? Per BBC News

A line in this BBC report https://www.bbc.co.uk/news/uk-politics-45495568 caught my eye:

'However senior voices in the European Research Group - yes them - are adamant that it is not the time to try to oust the PM. It would be "stupid", one told me last night.'

What was the purpose of that "yes them" value judgement? BBC bias front and centre as always.