Not unless you've hard coded any in your report, no. The rdl defines the report layout, and holds details of your dataset. The only thing it might reveal is your datasources credentials, IF you are storing them within the report. If so, i would suggest removing those first (you can copy the file and edit the xml of the file in any plain text editor). If you're using SSRS 2012 onwards, and using a shared datasource/dataset, this won't be revealed.

On a side note though, it is impossible to have 2 textboxes (or objects) with the same name. If you did, somehow, have two objects with the same name the report would fail to generate.

Without seeing your report, personally I would put a filter on your tablix in the tablix properties (I haven't opened your xlsx file, as I can't open untrusted xls(x) sources at work).