I'm not saying Biden's plan is better than Bernie's. However, it is better than any Democrat's climate change plan outside of Hillary & Bernie in 2016, and frankly, any actual climate change plan that passes will look closer to Biden's plan than Sander's.
Putting that aside - yes, Biden is doing that, because that's how elections work, or at least how they've worked for decades before this.
When George W. Bush ran for President in 2000, he didn't say, "I'm going to massively cut taxes for the rich, put Dick Cheney in charge of foreign policy, try to lessen abortion access, etc." No, Bush ran on restoring honor to the White House, not getting involved in nation building, giving the middle class a tax cut, protecting Social Security with a lockbox, and the bi-partisan education & Medicare drug bills he wanted to pass. You run on the stuff that's popular to the median voter, then while in office, you pass those things, along with some things that your base wants that hope doesn't piss off the median voter too badly.
I think 2016 broke people's brains in understanding how the vast majority of political campaigns are actually won.