Elon tweeted something to this effect earlier in 2019, and people have sort of lapped that up as an irrefutable statement. It's not.
The statement only makes sense if your only dimension for evaluating competitiveness is raw range, perhaps indexed by price. This is only because no reputable long-range EV manufacturer is exposing the full battery capacity to the consumer. Tesla throws power tools out to the general public and says, "If you use it wrong, it's on you. Don't suck." Other manufacturers take a more conservative approach.
The result? Sometimes habitually overcharged Tesla battery packs take a nose dive. Sometimes people Smart Summon their cars into posts. Sometimes people on AP smash into fire trucks. "Well, you're holding it wrong" is Tesla's answer when that happens, absolving themselves of responsibility for inducing or encouraging those behaviors in perniciously subtle ways. This is not something to celebrate.
Raw range aside (achieved by said battery capacity exposure), the Taycan's drivetrain puts out more power, both one-time and on a repeated basis, than any Tesla drivetrain. The 2019 I-PACE offers a luxury interior and more range than an equivalently-priced 2019 Model X, along with CarPlay and Android Auto. The 2019 e-tron (given its ~20% battery buffer held back) is only about 10% less efficient than a 2019 Model X, but it also has a superior interior as well as excellent road noise isolation.
In 2019 Electrify America has averaged a new site a day. Non-Tesla EVs can now use that charging network to get pretty much anywhere a Tesla EV can get using their proprietary supercharging network.
The rest of the market is not as far behind Tesla as a lot of pundits would have you believe, and in many ways competitors are actually ahead. Continuing with the iPhone analogy, in ten years we could very well find the EV industry looking like the smartphone industry today, where Apple still makes very good smartphones with a respectable user base while a variety of Android phones command the bulk of the market share.