The Revolutionary War Roll records do not give specific birth dates or name of spouse. Some do give age at time of enlistment or draft. Extremely rare "size rolls" may give place of residence, or even occupation. If you really want to prove whether you are descended from the person listed in the database, you should go to the trouble to find the actual roster(s) mentioning him. If he was not a deserter and not courtmartialed, he would be a patriot.
You do not say why you believe your person of interest was "from" Tolland, CT, was born 22 Apr 1741, or died in 1780 in Carolina.
If this person is not in the DAR patriot database, it is because no woman applied under his service.
It is possible that the person whose listing you found is not the one with the birthdate you give, or not from Tolland, or did not marry the person you state as wife of an Aaron Preston. Or all of the above.
Since no woman has submitted a successful application as descendant of the person who you say died in 1780, DAR does not have information about death at the time you give.
DAR does not maintain a database on all patriots.