Apparently "one ERG source said the group was unconcerned about [the release of no-deal analyses] because the public paid no attention to "project fear" at the referendum."

That seems an unwise way of looking at things. He or she may be right in the event of a second referendum. But it will be a very different thing if one or more of the warnings turn out to be correct and those suffering the consequences know the MPs were told beforehand but chose to let it happen.