First off, "identity politics" and centering ideologies around physical characteristics, religious views (almost as unchangeable), or ethnic backgrounds is practiced across the political spectrum. According to Wikipedia at least, "Left-wing politics supports social equality and egalitarianism, often in opposition to social hierarchy"[1]. There's nothing specific about identity politics there.

Secondly, looking at the website that's not even the whole scope of the program. For example, they have diversity initiatives for veterans, people with disabilities, and employee resource groups for older people.

1. https://en.wikipedia.org/wiki/Left-wing_politics

So this "diversity" is also part of right-wing politics then? And if so, why is there any political disagreement about it?

I don't know why you have scare-quotes around diversity, but practically every company has diversity initiatives (random examples)[1][2]. The existence of such says nothing about the company's politics, or those of its employees, one way or the other.

I have no clue what you mean by "diversity" (with scare-quotes), so I can't really answer your question. A simple search for the words "diversity" or "diverse" turns up nothing on the Wikipedia page for left-wing politics.[3]

1. https://corporate.dow.com/en-us/about/company/beliefs-and-cu...

2. https://www.lockheedmartin.com/en-us/who-we-are/global-diver...

3. https://en.wikipedia.org/wiki/Left-wing_politics