The error message is clear: webread replies the data delevered from the internet. Therefore the name of the variable "filename" is misleading. Store the obtained data in a file and use the file name as input for audioinfo. But then you get only the parameters which have been defined during writing the file. The original frequency must be requested directly:
[data, freq] = webread('http://file-examples.com/wp-content/uploads/2017/11/file_example_MP3_5MG.mp3', options);
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