Refusing to hold a hearing for almost a year, and then rushing a hearing in a very short time, is how Republicans, including Lindsay Graham and most especially Mitch McConnell, did what _I_ call packing the court. They distorted the timing like that to prevent Obama's pick from even getting a hearing, but they behaved oppositely to rush Trump's nominee much nearer to the end of _his_ term. The result is that the court has 3 picks from Trump's 4 years in office, and 2 picks from Obama's 8 years in office (would have been 3 but for the Republican-led Senate refusing to hold a hearing for Merrick Garland, for almost a year, and then the chance for Garland expired.)
If the Republican-led Senate had waited even a fourth as long to hold Amy Comey-Barrett's confirmation hearing as it waited to hold Merrick Garland's confirmation hearing (that one was delayed almost a year, designed to be never, and effectively never), then there would have been 2 justices picked during Trump's 4-year administration and 2 from Obama's 8-year administration.
But they didn't wait, they rushed the Comey-Barrett confirmation hearing.
The result is that we have 6 "conservative" justices and 3 "liberal" justices. So the "conservative" justices are in a kind of supermajority. This may have very _long_ consequences as justices have life terms.
What I read was a fairly modest suggestion that the court be increased to 11 justices. This would (if unobstructed by the Senate) allow Biden to appoint two, presumably what we call "liberal" ones. Then there'd be 6 "conservatives" and 5 "liberals". In that scenario, the "conservatives" would still have a majority, but not an overwhelming "supermajority".
Even more modestly, Biden wanted to appoint a bipartisan committee to study the matter for several months before making any changes at all.
Under the reasoning that an overwhelming "conservative" power is better than some more evenly balanced "conservative-liberal" power, Mitch McConnell (if backed by Republican majorities in both houses) upon resuming power may decide to increase the court to 11, when there's a Republican president, so that he can shoehorn in a couple more "conservatives", increasing the supermajority to 8 "conservatives" to 3 "liberals". Would that be packing the court or not? There's nothing in the constitution that requires the court to be just 9 justices. Don't forget what you think now, of this scenario, because Mitch McConnell might really do such a thing if he lives long enough; we've already heard his excuse: "You would do it too." (That's what he said regarding stalling Garland and rushing Barrett; and such an excuse would work as well in any other situation.) And we've already heard Lindsay Graham saying "Use my words against me" and then doing the opposite of what he had said. We've learned what sort of behavior to expect from them.