The 1e53 kg estimate is based on the observable universe (radius 46 Gly) being flat, and ordinary matter being 4.8% of what's keeping it flat.[1] Is it meaning

The 1e53 kg estimate is based on the observable universe (radius 46 Gly) being flat, and ordinary matter being 4.8% of what's keeping it flat.[1] Is it meaningful that just this baryonic matter has a Schwarzschild radius near that of the Hubble (14.5 Gly) and Cosmic Event (16.7 Gly) horizons?[2][3] Then there's the question of how much baryonic matter we actually see...[4] [1] https://en.wikipedia.org/wiki/Observable_universe#Estimates_based_on_critical_density https://en.wikipedia.org/wiki/Observable_universe#Estimates_... [2] https://en.wikipedia.org/wiki/Cosmological_horizon https://en.wikipedia.org/wiki/Cosmological_horizon [3] https://physics.stackexchange.com/questions/60519/can-space-expand-with-unlimited-speed/63780#63780 https://physics.stackexchange.com/questions/60519/can-space-... [4] https://en.wikipedia.org/wiki/Missing_baryon_problem https://en.wikipedia.org/wiki/Missing_baryon_problem