I've read one of his books and listened to his "Stalingrad" podcast. I found both quite easy to digest and enjoyable. I also saw that several of his audiobooks are public domain on youtube.
Some his writing is quite specific about troop movements and dates and seems to use a lot of both first and second hand information. How reliable or "accurate" are his books considered to be? It seems like our understanding of WW2 and the 20th century is evolving quite a bit throughout the years. Thanks!
Antony Beevor’s work is highly accurate and widely used within the scholarship. I’m a historian myself being a recent graduate of the subject.
Beevor has served in the army and is also a military historian as well. He is well respected and his works are extremely accurate.
We are finding out more and more information about The Second World War all the time as documents become declassified and new information comes to light as you rightly say.
I myself have used several of his works within my own essays and each time found the information to be extremely accurate and useful. Just my opinion and that of a few others that I know.
So far there hasn't been a post on Beevor in general, but there have been some threads on specific works of his. Thus:
D-Day: The Battle for Normandy is on the sub's WWII booklist, which I feel is endorsement enough of that book. u/Georgy_K_Zhukov has collected some scholarly reviews of Berlin: The Downfall 1945 in this thread, while u/Jon_Beveryman comments in this thread on Stalingrad: The Fateful Siege, 1942-1943.