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بعد بحث معمق عن المصطلح بالعربية, لم أجد إجماع على المعنى العربي إذ أنه ما زال موضع بحث

هو ليس مجتمع فرداني: لأن الفردانية هي ببساطة individualism والمجتمع الفرداني هو individualistic society

Individualistic Society:
An individualistic society places a high value on individual rights, personal freedoms, and the pursuit of individual goals. It recognizes and respects the autonomy of individuals within a broader social context.
In an individualistic society, individuals may have the freedom to express their uniqueness, make personal choices, and pursue their own interests. However, this does not necessarily imply complete isolation or lack of social connections.

Atomized Society:
An atomized society takes the concept of individualism further and suggests a state where individuals operate as largely isolated and self-sufficient units. The term "atomized" implies a higher degree of separation, potentially leading to weakened social cohesion.
In an atomized society, there might be a more pronounced lack of shared values, collective identity, or strong social bonds. Individuals are seen as operating in relative isolation from each other.

من بين المصادر أقرب ما وجدته إلى المصطلح الإنكليزي هو: مجتمع متذرّي, مجتمع ذاتي التمركز
social atomism: الذرية الاجتماعية

https://en.wikipedia.org/wiki/Atomism_(social)