when you watch your nurbsCylinder3 in the channelbox you will see that its scaleX attribute is yellow (mostly). that means it has a connection to some other attribute from this or another object or whatever.

if this connection happened by accident just right click scaleX and choose break connection. now you can apply the freezeTransform operation.

if otherwise this connection is of any use - means you put it up by purpose -> you can´t perform a freeze transform on things with incoming connection.

kind regards_