Great research!
Lets look at probability here as opposed to possibility.
As far as we are aware, no medical attention was sought by or for TM and/or MM. Surely if they had requested medical attention, it would have been provided. We can assume therefore, in all probability no request for medical attention was made by them.
In an earlier post Truthseeker79 referenced a San Diego study and inferred that in 62% of cases victims had no physical signs of strangulation. However, closer reading showed Truthseeker79 to be mistaken, as it simply says LE failed to REPORT the physical signs, and the study was an attempt to improve LE procedures and skills in this area. This does suggest however, that some LE officers may miss the less obvious signs of strangulation.
As you say, none of us was present at the crime scene, so we can't be certain of the signs of strangulation in this case. But Davidson County LE were, and assuming they are even reasonably well trained, skilled and experienced, it is probable they would have called for medical attention for MM, had they seen any signs, and mentioned this in their reports - especially if the alleged victim had mentioned it.
It is true that TM said in the 911 call, "he was choking my daughter", but this would probably not have been relayed to responding officers since it was in the past (i.e. 'was choking' as opposed to 'is choking', and was not directly relevant to the emergency they were responding to. Besides which TM and MM had ample time to bring it to the attention of LE, if they considered it relevant - and it was not mentioned in the police reports as far as I am aware.
This brings us to the 'symptoms' of strangulation you refer to above. We just don't know if there was evidence of some of these in this case, such as difficulty swallowing, swelling of the tongue and dizziness, but the others such as raspy, hoarse voice, and nausea or vomiting would have been apparent from the 911 call and/or reported observations by LE.
Since the audible symptoms were not evident from the 911 call, and the others were apparently never reported by, or to LE; no physical signs were reported, and there has never been a claim thar a request for medical attention was made by MM at the scene, we can conclude that in all probability strangulation did not occur.
All the above is my opinion only.