My DPO basically told me that since reddit told me (I contacted reddit first as per the GDPR) that I can delete my comments myself I should go ahead and do that, and that my case was closed. Even after telling her that there were still 2 comments visible only when my profile is viewed "signed out", and I provided a screenshot of a regular browser window where I am signed in and an incognito window where I am not, her reply was that once I delete my account they will not be linked to me in any way so they do not violate the GDPR...