You did not understand the original comment. They implied it without saying it in as many words. Here's how: they presented the fact that Drano apparently gets a $2 ROI showing ads on TikTok as evidence to back up their claim that the companies measuring the effectiveness of ads are making shit up. You can argue whether that's the intended communication, but clearly that's the communication I received (and probably not just me, hence the other person explaining that Drano ads for kids could have a positive ROI).

As a side note, I must say I feel this conversation took on a negative (and condescending?) tone.