The article does briefly mention the cosmological constant problem in BB too, something not well known apparently today concerning the BB model and expansion of space.
"Quantum theory predicts that empty space, the vacuum, is packed with energy. We do not notice its presence because our devices can only measure changes in energy rather than its total amount. However, according to Einstein, the vacuum energy has a repulsive gravity – it pushes the empty space apart. Interestingly, in 1998, it was discovered that the expansion of the universe is in fact accelerating (a finding awarded with the 2011 Nobel prize in physics(opens in new tab)). However, the amount of vacuum energy, or dark energy as it has been called, necessary to explain the acceleration is many orders of magnitude smaller than what quantum theory predicts. Hence the big question, dubbed “the old cosmological constant problem”, is whether the vacuum energy actually gravitates – exerting a gravitational force and changing the expansion of the universe."
Here is an interesting report on the topic. The Cosmological Constant Is Physics’ Most Embarrassing Problem,
https://www.scientificamerican.com/...onstant-is-physics-most-embarrassing-problem/
"The problem with vacuum energy is that there's not enough of it. When scientists first started thinking about the concept, they calculated that this energy should be huge—it should have expanded the universe so forcefully and quickly that no stars and galaxies ever formed. Because that is clearly not the case, the vacuum energy in the universe must be very small—about 120 orders of magnitude smaller than what quantum theory predicts. That's like saying that something weighing five pounds should really weigh five-with-120-extra-zeros-after-it pounds. The discrepancy has prompted some scientists to call vacuum energy “the worst theoretical prediction in the history of physics.” Vacuum energy is thought to be the main ingredient in the “cosmological constant,” a mathematical term in the equations of general relativity. The enormous discrepancy between the predicted amount of vacuum energy and the measured amount is often called the cosmological constant problem."
My note. The cosmological constant is the Greek letter Lambda in GR equations attempting to show how the vacuum energy of empty space can expand space or create a static universe. The NASA ADS Abstract has a number of papers on this problem, e.g., Interrogating the Legend of Einstein's "Biggest Blunder"
https://ui.adsabs.harvard.edu/abs/2018PhP....20..318O/abstract, December 2018.
One hundred years of the cosmological constant: from "superfluous stunt" to dark energy,
https://ui.adsabs.harvard.edu/abs/2018EPJH...43...73O/abstract, April 2018.
There is more going on now with BB model than just the Hubble constant. I collected various reports on the Hubble Constant and found values ranging from 500 km/s/Mpc in the early 1930s and values ranging 67 km/s/Mpc to 75.4, some 80+ range now. Currently the cosmology calculators use this as a constant and the age of the universe bounces all around too.