Suppose you have a YouTube channel to which you have uploaded a video. People watch it, and YouTube keeps a note of how many times that happens. It also tracks other stats, such as “likes”.
But then suppose you decide to create a new, second channel. You want that same video to also be available on that new channel. So first, YouTube are telling you that there is no way to link the original copy — the one you uploaded to your original channel. If you want people who look at your new channel to see the video, you’ll have to upload it again; i.e. you have to upload a duplicate copy.
And so then they are telling you that the stats — number of times watched, number of likes, etc — on that duplicate copy, will start from zero. The stats for the original copy apply only to the original and are not “carried over” to the second, new copy.
As to what does “uploads” means: no, it does not mean “views”. It means...well, it means uploads! 😀 Uploading is the process by which you arrange for a video file that you have on your local computer to be sent “up” to the YouTube servers.