Incorrect IdentityBinaryExpression message?

errorprone version 2.15.0

For binary logical operations with multiple decrements on an array index like this

```java
if (((sieveArray[x--] | sieveArray[x--] | sieveArray[x--] | sieveArray[x--]) & 0x80) != 0) {
...

...
}
```

errorprone prints a `IdentityBinaryExpression` message:
```
[IdentityBinaryExpression] A binary expression where both operands are the same is usually incorrect; the value of this expression is equivalent to `sieveBlock[x--]`.
```

https://errorprone.info/bugpattern/IdentityBinaryExpression

The message is propably wrong?