The part of the sentence "is further buttressed" is correct and can be used in written English.
You can use this phrase to describe a situation where a particular idea or argument is further strengthened or supported by additional evidence or arguments. For example: "The reliability of the report is further buttressed by other independent research."
The gap is further buttressed in the following section.
It is further buttressed by Wittgenstein's explanation to Desmond Lee (in 1930 1) of Tractatus 2.01: "'Objects' also include relations; a proposition is not two things connected by a relation.
Cloud Gate is further buttressed by lateral members underneath the plaza that are anchored to the sculpture's interior structure by tie rods.
The evidence for specificity is further buttressed by the significant effacement of the reductive shift in cells lacking CRT.
This conclusion is further buttressed by the narrow distribution of the distances from LECA to extant species measured in RGC_CA units.
This conclusion is further buttressed by the substantially greater conductivity of lipid bilayers to protons than to sodium cations and by the existence of distinct mechanisms that make membranes proton-tight in different lineages of cellular life.
In choosing to speak in Hosni Mubarak's Cairo and appear cozy in King Abdullah bin Aziz al Saud's Riyadh, Obama is further buttressing the al-Qaeda leadership's raison d'etre.
Early British support for the South was further buttressed by something as mundane as a protective tariff — the Morrill Tariff — approved by Congress on March 2 , 1861
The cost estimates are further buttressed in private communications with the Nigerian Electricity Regulatory Commission NERCC).
Construct validity was further buttressed by significant correlations between IBS-QOL total scores and related measures of IBS-d severity including the historically-relevant Irritable Bowel Syndrome Adequate Relief (IBS-AR) item and the FDA's Clinical Responder definition.
