if obi wan says something to padme in ROTS after icing VADER, that is a half truth like in ANH, but leans more towards WINDU killed ANAKIN (which he may have seen in the hologram recording) then we may be able to just dismiss obi wans comments in ANH as just some inbuilt metaphor to ward luke from the dark side? the ROTS little 25% lie turns into a 50% lie in ANH

example:

my old manager always used to go on about another young employee who was really incompetant who he was going to fire, who i eventually discovered was totally fictitious, just designed to scare me.