No, Luke turned and almost killed his father. He only held back at the last moment when he realized what was happening, and how he was being drawn to the dark side. This is similar to what happened to Ben. He almost killed Ben, but held back because he realized the wrong in doing so.
In ROTJ, Luke to me never seems close to killing Vader, despite his unleashed rage after the "sister" moment. He defeats Vader, but leaves him on the floor (when he could easily have killed him, and significantly the movie doesn't even dwell on a "will Luke kill him?" moment) then refuses the Emperor's command to kill Vader.
I mean when Luke surrenders he talks to Vader as "father" saying he's there because of the good in him, and later declines to even fight him REPEATEDLY - Luke killing him, even after the sister comment, makes little sense. To me the bigger question was would Luke join the Emperor/darkside somehow.
Luke never "almost killed his father."
For Luke in TLJ, my memory is a little rusty but in BOTH versions (it's Rashomon style - we see Ben's and Luke's quite different POVs of the hut moment)
Luke does indeed go to that hut to kill Ben. This is a CRITICAL point.
In Ben's flashback, Luke goes ahead and swings the saber to kill him but Ben blocks, in Luke's version he ignites the saber to kill Ben, has a moment of doubt, but the sound of the saber has woken Ben, who attacks. Either way, Luke went 9/10s or more of the way to killing Ben.
These are two quite different Lukes - ROTJ vs TLJ.
Seriously, if I pick up a hunting knife and go to your tent in the middle of the night, unsheath the knife, and raise it above you as you sleep, that defines me a certain type of person, doesn't it? I would never do that, most people wouldn't, especially based on a sixth sense about something (didn't Yoda say the future is difficult to see, always in motion?)
To me, "my" Luke is not that person.
Luke hadn't just discovered proof Ben had murdered a couple of other students and was plotting something awful - he just had a bad feeling about Ben and where he was heading, his potential, his power (or something - curiously the movie has little interest in elaborating on this - SHOWING us what drove Luke to the hut.)
This is where Hamill's "not my Luke" came from. Forget hiding hermits, seacow teets, cowardice and skyping the climactic battle - this is the core of the Luke onion.
In some ways what Luke does triggers PTSD in Ben, altering Ben's memory of the near-murder event - so you can't even blame Ben for his version, and perhaps even partly for what he became. He woke up to his master in the moment of murdering him, whether he had a last-second change of heart or not.
This is a key point because SW is about continuity of family/bloodline and the choices we make. In this sense, TLJ Luke utterly betrays his OT origins and the thematic heart of the OT. And even worse, he does it not only to his force/Jedi protege, but to the son of his sister (whom he fought so hard to protect in ROTJ's battle) and the man who's like a brother to him, Han.
This is the muddle that the ST has introduced, partly in lazy and sloppy storytelling/flashbacks, almost as if people get confused about what they saw Luke doing because of the muddled way it's presented.