The phrase "arguably has not" is correct and usable in written English.
It can be used when discussing a point of view or opinion that suggests something may not have occurred or been achieved, while acknowledging that this is open to debate.
Example: "The project, while ambitious, arguably has not met its initial goals."
Alternatives: "possibly has not" or "may not have".
But that geological good fortune arguably has not translated into broader energy clout for Venezuela.
Even Trump himself, arguably, has not yet traversed the chasm of scrutiny.
This company is still in business, but arguably has not been nearly as successful as originally thought.
Released on 5 August, 1966, it changed everything, shifting the locus of pop from the single to the album, and announcing a period of intense creative momentum that arguably has not been equalled since.
OTTAWA — Basil E. Hargrove, the president of the Canadian Auto Workers union, enjoys a public profile in Canada that arguably has not been matched by his American counterparts since the days of Walter P. Reuther and Jimmy Hoffa.
Will corporate sponsors find themselves on the side of Spielberg and the Nobel laureates, or on the side of China, which, arguably, has not made good on any of its promises to promote decency, peace or human rights?
"Arteta arguably hasn't been at his best for Everton for a couple of years.
But making the app-switcher a continuous scrolling experience (which demanded an efficient blurring effect) arguably hasn't done much to improve multitasking on Apple's devices, overall.
Johnson arguably hasn't had such a long day in the field since 2010, when he leaked 0-104 from 27 overs in the second dig against England in Brisbane.
It's a brilliant, suspenseful, witty, drumskin-tight action film littered with truly iconic moments, and it arguably hasn't been bettered in almost a quarter of a century.
Here you have an industry that arguably hasn't changed since the printing press was invented, where the last innovation was the stand-up lecturer where someone would stand up and read out of a textbook to an assembled class.
