Originally posted by UCanShootMyNova
His power was less focused. It doesn't mean it was diminished or had suddenly vanished. Just like Luke not being able to lift the X wing yet still having the raw power to defend against Vader's telekinesis. Simply because one lacks focus or concentration at the time it doesn't mean they don't possess that power.
The quote isn't suggesting Darth Vader has greater raw power than Anakin Skywalker - it's confirmed he doesn't.
The quote is stating that Darth Vader has greater power than Anakin Skywalker as of the Mustafar fight, which is true.
If Anakin Skywalker can't bring his raw power to bare, then his potential power is irrelevant.
What is relevant is what he can actually use as his power - and the amount he can use is inferior to what Darth Vader's can.
He was blatantly focused on overpowering Kenobi in the telekinetic lock, but was unable to do so, because his power was insufficient.
The first is Vader denying that any former connections he had as Anakin matter to him now and the second was both a way for a big reveal to remain hidden and objectively Vader referring to himself in third person likely for the same reason he did so in the prior link you provided and his talk with Luke.
🙄
"It intensified, momentarily, Vader's own sense of anguish - to his crimes, now, he added guilt at the imagined repugnance of his appearance. But then this brought him to mind of the way he used to look - striking, and grand, with a wry tilt to his brow that hinted of invincibility and took in all of life with a wink. Yes, that was how he'd looked once.
And this memory brought a wave of other memories with it. Memories of brotherhood, and home. His dear wife. The freedom of deep space. Obi-Wan.
Obi-Wan, his friend ... and how that friendship had turned. Turned, he knew not how - but got injected, nonetheless, with some uncaring virulence that festered, until ... hold. These were memories he wanted none of, not now. Memories of molten lava, crawling up his back ... no.
This boy had pulled him from that pit - here, now, with this act. This boy was good."
The above confirms that the memories of his former life was suppressed by Darth Vader and not referenced until after he killed Palpatine.