Short answer
Only if you own or are authorized to process the stream and your workflow can capture the live window correctly. Live HLS changes over time, so a simple browser page cannot guarantee a complete MP4.
What to check
- Confirm that the stream is public or authorized for testing.
- Use the Checker to separate access problems from playlist structure.
- Do not treat a diagnostic result as permission to copy, bypass or redistribute media.
Next step
If the answer points to access, fix the origin policy or authorization first. If access works, continue with playback, segment and codec checks.