The playlist stream is different every time you run the GET call. The stream you are referring to above is the sequential streaming for that particular station and playlist session. If I request a stream from two other channels and want to go back to the original. I have to generate a new playlist URL and has a completely different GUID. I found this mentioned in a third party app someone made.
Tablo has a developers group you can join to get full API access. But I'm not developing an app and found most of the API calls by using wireshark.
If you get a playlist, it expires after 6 hours and 20 minutes unless you request other streams. Tablo is indeed different from HDHomeRun.