The URL parameter allows the filter to be set but the .twbx will download the entire workbook that the user logged in via tabcmd has available to them. One alternative I can think of is to manage this from the data source and limit the view based on a user to Tecnhology=28NM for that specific user in the data source. Then use this user to login to Tabcmd and download a .twbx.
User filters will not get you the desired output however since the .twbx downloaded would still contain the full data set and the filter could be removed. Managing on the data source is the only way I can think of to do this.
What Patrick Said. And another "pro" to keeping it a Data Server connection is that you're not constantly transferring large data files. The TWB will be a fraction of the size and all security can be managed remotely without worrying about certain data getting in the wrong hands.