I used to be a butcher and many of those things are spot on.
Here are some tips for you as well...
Stocking up...
Buy steaks in the dead of winter.
Buy roasts in mid summer.
They mention Prime as the best beef to buy. I disagree. IMO, Choice is tastier due to more marbling, but that is just my personal preference.
Info you may or may not know...
A Porterhouse steak is actually a NY strip on one side and Filet Mignon on the other side of the bone. T-bone is the same except there is less filet.
A chuck roast or blade roast is excellent for stew meat.
Prime rib- there is a lot of confusion with this cut of beef.
This piece is where the following cuts come from:
Rib steak - I would take this over a porterhouse any day.
Delmonico steak is just a fancy way to say rib eye. Take the "cap" off of a rib steak and there you have the rib eye.
Prime rib is also known as a rib roast.
Don't always buy the leanest possible piece of meat, it may not be that tender.
Lastly- If you shop at the chain stores, watch for deals on whole boneless pork loins. This is one of the pieces of meat I see most often on sale at a good price. It's boneless so you can cut it yourself for roasts, chops... whatever.