If bamboo is uncountable, then who are these bamboo here can't use s? Please take a look, thank you!

If bamboo is uncountable, then who are these bamboo here can't use s? Please take a look, thank you!

Yes,you are right.

When is the English word bamboo a countable noun

Noun n
one
Bamboo, bamboo [C] [u] 2
Bamboo [u]
Some furniture is made of bamboo.
Some furniture is made of bamboo
Pass me a bamboo rod.
Pass me a bamboo pole

Is bamboo countable?

To make sure the number of bamboos is not countable; for example, a few bamboos can not be plural;
For example, many kinds of bamboo are plural;
The same fish is the same, a few fish, can't count; a few kinds of fish, can count;