Yes, I believe so. Here's what the tweet referred to:
This is from Saban's Jan. 27 speech to the Alabama Football Coaches Association clinic in Montgomery:
"And this is a story you should take back to your team so players understand this," Saban told the coaches. "They’re frustrated with their circumstance because they’re not playing as much as they want to. They’re outcome oriented. They want to worry about how many balls they catch, or how much playing time they get, or whatever it is. So they don’t focus everyday on being a complete player at their position, and they don’t work in practice and prepare for the games because they say to themselves, ‘Why should I do this? I’m not going to play anyway.’
"So we had three guys - they all had a significant role in the national championship game. And not one of them - not one - could take advantage of the opportunity they had because they never ground through it. They never made themselves the best player they could be. And when they got the opportunity, they couldn’t do it."
Billingsley and Hall were two. Not sure about the third, but probably Holden. Saban didn't mention it here, but there was a similar issue with 5-star freshman RB Camar Wheaton. He didn't play all season supposedly because of a meniscus injury to a knee, but the word is that it wasn't that serious, he could've played (there was a HUGE need for RB's due to injuries), and the real issue was grades, poor class attendance, bad attitude, lack of effort in practice, and laziness. He's already entered the transfer portal and will soon be someone else's problem.