The article does not say why this is so significant. The timescale of variability places limits on the size of the engine that powers the source. If the brightness varies on a timescale of an hour then the (causality, speed of light) the engine must be ~ a light hour in size.
https://phys.org/news/2021-01-suzaku-x- ... lazar.html
Suzaku observations find X-ray intraday variability of blazar
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Suzaku observations find X-ray intraday variability of blazar
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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