I think it’s the thing every Labour Leader since Blair (other than Corbyn) has said- I even remember the democrats in 2008 having the same argument over Reagan.
Obama praised Reagan for being a transformative President unlike Clinton which was true, saying Thatcher left a positive legacy would actually be wrong. The goal should be to be transformative like Thatcher btw but of course those realignment plans never work if they're revealed pre-election, so we can always keep our fingers crossed I guess. Obviously he's just tossing out words without caring about what they would logically mean, but everyone should know that Thatcherism and left-wing politics are completely incompatible.