Pretty much the title tbh.
I had recently come across this podcast and I found quite a few of their episodes to be intriguing, however as I was a layperson I was wondering if people with a little more formal expertise could comment on their accuracy and reliability (to any degree they were familiar with).
Whist you are waiting for answers specifically about this podcast, you can read our previous discussions about Tom Holland. He seems to not have a great reputation among historians. In this thread u/J-Force, u/Daeres and other users discuss him thoroughly and critically. However it seems Dominic Sandbrook is an actual historian, so it might be more accurate than his other works, but that is not something I myself can answer.