Personally i don't consider the change to be signficant.
Moreover, it does have polling support. While net zero has 71% support, individual measures like banning gas boilers and combustion engines are basically 40-40 but with 2019 Tory voters being opposed to the tune of 56-68%. The electoral math for the Tories is clear, if they can get back the 2019 vote, they win. Thus despite the whaffle, the logic is there and it won't harm them among the people that matter.
My own personal view is that i would support keeping the target at 2030 but it's not a priority issue.