There are 2 issues here:
1. US and Chinese laws about food seed importation are routinely evaded. This could result in importation of a disease or insect eggs which could devastate American agriculture.
I just got the first item I ordered from SEEDVILLE via Amazon. It came from CHINA and the shipping doc identified it as "wall stickers." That mislabeling violates US law, and probably Chinese law as well.
Seedville's name was nowhere on the package or the seed envelops. Whether that is because the Chinese company is selling the same package to other distributors, to hide the fact that these are seeds from the Chinese and American postal authorities or to protect SEEDVILLE from being implicated, I don't know.
In any case, before buying ANY seeds from China, Google "importation of Chinese seeds.
2. Apples have not been grown from seed for over a century, except for experimental purposes.
This is because apples from seed will ALWAYS be different from the parent plants. To propagate apple trees, a twig is cut and rooted. Sometimes a flavorful apple's twig is grafted onto a hardier root stock.
Neither of these procedures are difficult. But unless you want to invest 5 or more years of gardening before you taste the first apple which might even be tasteless, buy a young apple tree.
And remember, if you're going to grow that apple tree in a pot like the pictures, the tree must be hardy in at least 1 zone colder than your own zone. This is because the temperature of soil in a pot is much more variable than soil in the ground. You will also need to add fertilizer more often. I recommend a slow release (not liquid) organic fertilizer. When it rains, add a few live earthworms and cover the soil with leaves or dry grass clippings, which will feed the worms, so you may need to replenish often.) The worms will make air passages which protect from root fungal diseases.
Look at trees of the same size as what you want and buy a big enough pot for your young tree to grow into, to save a lot of labor. Larger pots require watering less often than small ones do.