Yes, per the 2024 rules on Difficult Terrain
It's true that the quoted rule isn't in the 2024 PHB, but according to the sidebar "What's new in the 2024 Version?", on p. 5:
If you can't find a rule, check the index. If a rule's name has
changed from what was printed in the 2014 Player's Handbook, the index
points you to the new name. For example, if you look up Inspiration in
the index, it points you to the rules for Heroic Inspiration in the
rules glossary.
And we can still find the term squeezing in the index on p. 383:
squeezing. See Difficult Terrain, 24, 366
The rules
Difficult Terrain on p. 24 states:
Combatants are often slowed down by Difficult Terrain. Low furniture,
rubble, undergrowth, steep stairs, snow, and shallow bogs are examples
of Difficult Terrain.
Every foot of movement in Difficult Terrain costs 1 extra foot, even
if multiple things in a space count as Difficult Terrain.
And in the Rules Glossary, Difficult Terrain on p. 366 states (emphasis mine):
If a space is Difficult Terrain, every foot of movement in that space
costs 1 extra foot. For example, moving 5 feet through Difficult
Terrain costs 10 feet of movement. Difficult Terrain isn’t cumulative;
either a space is Difficult Terrain or it isn’t.
A space is Difficult Terrain if the space contains any of the
following or something similar:
- A creature that isn’t Tiny or your ally
- Furniture that is sized for creatures of your size or larger
- Heavy snow, ice, rubble, or undergrowth
- Liquid that’s between shin- and waist-deep
- A narrow opening sized for a creature one size smaller than you
- A slope of 20 degrees or more
Conclusion
The emphasized sentence, "A narrow opening sized for a creature one size smaller than you", along with the Difficult Terrain rules, represents the 2024 equivalent of the 2014 text.
