The phrase "almost certainly refer" is correct and usable in written English.
It can be used when indicating a high likelihood that something will reference or point to a particular subject or idea.
Example: "The findings of the study will almost certainly refer to the impact of climate change on biodiversity."
Alternatives: "most likely indicate" or "probably relate to".
Although the report does not identify the country that manufactured and delivered the weapons, Pentagon analysts say the missile proliferation statistics almost certainly refer to North Korea.
The IAAF will almost certainly refer the case to the Court of Arbitration for Sport in Lausanne, which will examine the evidence and reach a judgment that is final and binding.
When historians come to write about the digital transformation currently engulfing the book-publishing world, they will almost certainly refer to Amanda Hocking, writer of paranormal fiction who in the past 18 months has emerged from obscurity to bestselling status entirely under her own self-published steam.
There are walls depicted on other pages of these books too and they almost certainly refer to Jerusalem". It is the cross that is the most telling feature, in the shape of a capital T, as the crosses used by Romans for crucifixion were.
Miller was almost certainly referring to what he perceived to be dirty play by Fox.
This almost certainly refers — by way of Gematria, the Jewish numerological system — to the contemporary Emperor Nero.
Deccan almost certainly refers to the Deccan Plateau located in the South of India, an area that is becoming a hot spot for militant recruitment and operation.
"So great that oil prices are falling (thank you President T)," Trump wrote — almost certainly referring to himself, and not the London-based rap musician, @Prez_T (warning explicit content).
They don't say it explicitly, but Facebook is almost certainly referring to the fallout from Gizmodo's reporting on the team that suggested (among many other things) that the Trending list was "biased" against conservative topics and news sources.
Big Peaceful Water, Big Pond and Snake Lake are among the various translations of a word that almost certainly refers to the 593-acre body of water that distinguishes the hamlets: Lake Mahopac.
In fact, the signs almost certainly referred to sugar-beet; even so, to equate "betteraves" with those other non-edible road-threats such as "gravillons," "chutes de pierres" and "chaussée déformée" seemed a little contemptuous.
