I don't think I've ever heard of a poodle not being able to walk on cement for the first few months for leg reasons--although if it's hot enough, it can burn paws, and if you visit a site where dogs frequent, then sure, the dog can pick up diseases. Maybe the breeder has gotten confused with running on cement--that can damage joints in the early months for any dog. As for jumping off the bed, it depends on how big of a toy you have (and how high the bed is off the ground). If the dog has patellar luxation, which many poorly-bred toys do have, then I would caution against letting the dog jump off of anything. Pretty much any dog can injure themselves jumping off of things, but you do have to remember that 1 1/2 ft to a 7-10 inch dog is a lot more than to a dog that is 15 inches. Have you thought about mini poodles? Those dogs are a bit sturdier, and taller, if that is a concern.
I will admit that I take much greater care with Fluffy, my slightly oversized 11 inch toy poodle, than I do with my JRT mix, simply because the JRT mix is a block of muscle (Fluffy is half her weight!), and he does have knee problems. Before we found out about those problems, he jumped off and onto couches many times without a single issue, and surprised us with his athleticism, often jumping higher than the JRT! He has no problem keeping up on our daily walks. Toys are fragile, though, especially as puppies, so you would want to be cautious about letting a puppy jump on things.