Re: we will not be commenting publicly on issues in the run-up to the General Election
As the article makes clear, it's because of Purdah. It's a well established thing.
Negative findings could reflect poorly on (say) the recent Conservative government despite (say) being attributable to cuts to Policing budgets by a local Labour Council, a Plaid Cymru Police and Crime Commissioner or general incompetence by civil servants/Police leadership. For other elections, chop and change those parties as you prefer.
Or they might indeed be down to BoJo and chums. Main point is that the scum media certainly won't paint a responsibly-nuanced picture, so they don't release it at all until afterwards - preferring you to focus on the manifestos and record-to-date.
Anyway, it's standard. A sports club I was a member of received a SportEngland Grant in the run up to an election. We couldn't publicise it until after the election because it might reflect positively on the incumbents, even though the grant decision is apolitically made by SportEngland (though the pot of money they have to play with is in the gift of DCMS).