You seem to have misunderstood what is going on here. The data here is Google's data. They sell ads to political parties. They then make details of those ad sa

You seem to have misunderstood what is going on here. The data here is Google's data. They sell ads to political parties. They then make details of those ad sales available to researchers to let them understand how political ad spending is happening in different countries. This researcher is complaining that Google appear to have changed their mind about making that data available.