Looks like bamboo or laminate click flooring to me.

Edit: Looking at those new pics he posted though looks like you might be right. The backs look like tiles so maybe it's that tile that is printed to look like wood/bamboo. If that's the case then he can pull the tiles and lay down some tile cement and put the tiles back after cutting the door one a little so it fits.

It's really weird to not have grout if it's tiles as that would make the floor not waterproof.

This is 100% porcelain tile. I worked in a tile factory- there’s no mistaking it.

It’s a hard, inflexible material. I have heard it referred to as composite.

You know, that does look like they grouted it. You might be able to get away with just removing that grout/caulk and then just redoing the pattern. If the floor can't move it will buckle but the pattern will make that problem even worse. So with both problems it was kind of just a given. If they added that grout because the whole floor moves then you can get non slip underlay to prevent that movement.