Sorry, no. There's no evidence of that - vote share and numbers doesn't really mean anything in this system, especially with millions of people voting tactically this year (stopthetories.vote had almost 2 million uses, and that's just one of many sites); the surge of Reform, who only got 600k votes in 2019 as the Brexit Party, and other parties & independents gave the electorate far more choice than before. Also, turnout was much lower, either due to voter apathy or reports of consistent polls showing Labour miles ahead giving the impression people didn't need to vote.
Labour have been in the lead of the national polling for 2 and a half years, maintaining a 20pt lead for at least 2 years. They ended the campaign polling better on every single subject vs the Tories, having lead most of them for 2 years. Since 2020 Labour have won back hundreds of councillors, dozens of councils, hundreds of police and crime commissioners too. They also have the highest number of mayoralties - 20 out of 25. Pretty much every single one of those was down under the previous leadership.
Obviously the Tory's corruption and meltdown helped, but there has been a clear strategy and change at Labour especially since they lost Hartepool in 2021.