They went to Brazil to learn- guess who the Brazilians learned from? They've been learning since as evidenced by their shift away from the Soviet/European ski jump to a flat top that is much closer to an American design. I'd wager that their aircraft are a bigger problem than the vessel itself. The J-15 is currently the only fighter aircraft they're operating off their carriers but the J-20 is supposed to be able to (I haven't kept up with them so not sure where they are on that). The Soviet designed but Chinese built engines on their aircraft are maintenance intensive.The Chicoms may have the boat, but can they actually run the damn thing?
U.S. Navy Aircraft Carrier Flight Deck Shirt Colors Explained - YouTube
Carrier ops ain't easy and not something you can steal by looking at a video....
That said, remind me when the new USS Enterprise is scheduled to be commissioned (construction started in 2017 and it's scheduled to be commissioned in 2028 for those wondering)? How long did it take China to build carrier number 3 (they acknowledged it in 2018, photos showed it in 2019 and now it's in the water)? How long will it take China to build and commission their next carrier (which will be nuclear powered) and how long before they start laying up the next one (I've seen multiple people say that they will start laying up the hull sections as soon as possible)? Folks are forgetting that range is not as important to them as it is to us- they expect to fight in their yard, not ours. Couple that with their "String of Pearls" and the island bases/small airbases that they have within their claimed nine-dash line and how many more are they building (uncontested at that) and they have the ability to spread resources around the area while we've been losing ground in the area (big problem- the Philippines just elected another Marcos who's said he wants to work more closely with China). They're working to modernize their subsurface fleet as well as increasing the number of nuclear powered vessels (for those questioning if they can build a nuke power plant)- they have four nuclear powered (and equipped) missile carriers and seven nuclear powered attack submarines and they're on track to basically double the number of each type by 2030; they've got around fifty five diesel-electric attack submarines. Just because the Chinese widget you bought at Walmart is crap doesn't mean what they build for their own military is.
No, they're definitely not peer level yet, but they are putting a ton of resources into building a blue water navy while doing things like feeding their soldiers high protein diets to make them physically larger and toughen them up while we're changing ours into "women" and worried about shaming and using proper pronouns all the while throwing money are ridiculous social projects and non-strategic interests.