Completely untrue. The Tories have been ahead in most recent polls. This after the Tories let 40,000 people die. Labour should be 30 points ahead in the polls. In any case Labour had large polling leads under Corbyn and Milliband and ended up losing elections, it means nothing at this stage.
The only good metric going for Starmer is his approval rating which the media keep trotting out, but they neglect to mention the fact that the poll is biased because a significant number of people don't even know who he is, meaning Labour voters are over-represented. His "approval" is mostly from Tory and LD voters who have no intention of voting for him which helps no one.