Certainly there's a point here, but it's not complete. I, for example, living out in the country, have a septic tank, and indeed, it's my responsibility, and it's maintained at my expense. I'm way out of the region served by my small town's sewer and water systems. No municipal or other solution to that is possible, short of zoning to require that land perk before it can be built on (which now exists) and a "sorry, buddy" policy for those whose land was built on before zoning. But this is also not Alabama.
One big question here is whether the reliance on individual septic in the area in question is a result of remoteness or of the failure of a local community to address the need for municipal sewage in an area that cannot sustain individual septic systems. It's likely to be pretty complicated to sort out why that community exists and is settled as it is, what the responsibility of the surrounding area is, and so forth. But if you read the article, it mentions that this problem has existed for a very long time, and is at least in part the result of a policy going back to former policies that relegated black populations to areas with unsustainable septic conditions, known to be so when it was done.
You can argue about the language, the philosophy, and the operational details of many things, but if you look at everything as if it were alone in time and place, I think you will miss some of the underlying reasons for why things as they are got that way. Many DEI programs may be lacking in subtlety and completeness, over-simplifying the complex processes by which the present came to be, and no doubt offending those who feel burdened by the sins of the past from which they unwittingly arose. But the wholesale dismissal of everything that smacks of DEI does more than over-simplifying the complexity. It ignores it.