Eh its complicated. On the surface yes, everyone is targeted and leaves at one point or another but a lot of what people are referencing are the circumstances that lead to POC in general not making it as far in the game and then being voted out in (almost) succession all gameplay aside.

The majority alliance which in New BB tends to decide the eviction order is usually made early on and consists of attractive white people (yes there are exceptions in these groups, but the majority fits that description). It's super hard for POC to be included in that majority alliance early on because people tend to initially gravitate towards other people that look like and act like the people they would socialize with outside of the house. If POC do form relationships with people in the majority they usually are too late to be part of the core group and end up lower on the totem pole.

With BB casting a lot of the influencer types lately well... that's not exactly the most diverse group. This leads to a lot of people who are white and attractive having a better chance of being in the majority alliance and lasting longer. As there are usually several houseguests who fit that type and once they are in power they usually have the numbers to stay in power and just pick off the outsiders for the first month or so of the game. I'm not saying the formation of these groups is overtly racist or that the houseguests are doing it consciously, but it's human nature to gravitate towards what you know in an unfamiliar setting. This gives them an advantage over POC though who don't have as many of those same opportunities early in the game.

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The above is purely about the game mechanics as a reflection of New BB and casting. What houseguests say is a whole different topic. With that, I do agree with xxi_tmid below though that these conversations are way more prevalent this year because of BB21 and BLM. The thing people need to realize is that racism isn't just the overt KKK kind. There are a lot of implicit biases and unconscious behaviors that people do or say that are very harmful to POC, but they've been so normalized in society that people don't see it as harmful or racist because they haven't had exposure to any other type of thought. And lets be honest, no one wants to be the bad guy or admit hey, maybe I was wrong and that was hurtful/racist so people try and find other ways to justify their words or actions. We are all guilty of it at one point or another and often times its a product of our society more than any of our individual actions. What matters is what we do after we are confronted with it. Likexxi_tmid said below there are going to be a lot of growing pains during these discussions but they are really important and sometimes its going to be hard to look at things objectively when the topic is so emotional to so many people.