they're not lying. Loopring is one example among half a dozen. The issue is that current L2's are purpose-built by individual dapps. What doesn't currently exist (should be released in next few months) is the code that lets you copy/paste your current L1 code into an L2 code with almost no effort. At that point all the current dapps running on L1 can just port over to L2 very quickly and without the huge risk of a bug in a ton of new code lines.