If you suspect cheating, you can do so through your Game History on your profile here on Bungie.net. You can also find more information on reporting suspected cheating here:
https://www.bungie.net/en/Help/Troubleshoot?oid=13967
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I go to game history, click on suspected player's name, go to his profile, see he hid all of his match histories. Then I click on the ... on his page and hit report. I scroll to "cheating/hacking" and after hitting confirm, it says "The requested profile can not be found"
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I did go through the game history bit, but when I report the player it says they aren't found
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I understand you now. On the article I posted above, there is a Contact Help link that will bring up a form. You can use that to submit the information that you've collected to Bungie. They may be able to better investigate this beyond what you have been able to do so far.