Any coin that survives this bear market will do well come the bull season
What do you mean survive? Many altcoins will survive, but they may not have the funds for further development and they will continue to exist, but they will not show much growth. They may have some small periodic pumps, but it will be difficult to call it growth. If you want to invest in altcoins, then at least look at who has good pumps now, this will increase the chances of them repeating in a bull market, but remember alts are always big risks.
I think by survive they mean that something that will not go down too much, like if the market goes down 60% then it should continue to go down with that much and not more. Just to give an example, the whole market is down but Luna is even more down because of the problem they had right? That's a good example, it's more down than everyone else. That's what people mean when they talk about this.
I believe that not all coins would go down the same amount, but the reality is that not all coins will go up as much as the other ones during the bull run neither. That will be the decisive factor, the ones that go up more than the others will profit you a ton.