The source is a single arXiv abstract describing a paper on Arend, a theorem prover developed at JetBrains Research. The abstract presents the paper as an exposition of the system, meaning it explains the language and its design rather than introducing new theorems or benchmarks.
Arend's stated purpose is to support the formalization of mathematics within univalent foundations, a framework for mathematics that emphasizes the idea of equivalence between mathematical structures. The abstract is truncated, so the source does not provide further details about Arend's specific features or how it compares with other proof assistants.
Because only one source is available, there are no differing accounts to reconcile. Readers should treat the summary as limited to what the arXiv abstract explicitly states.