The below given is the content which can be found in QTP manual. Specify the key WebTable Object and search QTP manual you can find more.
A table containing a variable number of rows and columns.
The tables below list the built-in methods and properties that you can use as operations for the WebTable object.
Note: You can also view a list and descriptions of the WebTable identification properties, for use in object repository descriptions, programmatic descriptions, checkpoint and output value steps, and as argument values for the GetTOProperty and GetROProperty methods.
The issue what you have listed does not exist, works fine in my machine- stupid comment from the developer