Private static methods in NodeJS v12.13.0 - syntax error - node.js

Question

As described in the JavaScript Reference by Mozilla here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Class_fields#Private_static_methods
This is how private static methods should work:
class Foo {
static #privateStaticMethod() {
return 42;
}
}
However, when using this in NodeJS v12.13.0, the following syntax error is thrown:
static #privateStaticMethod() {
^
SyntaxError: Unexpected token '('
at Module._compile (internal/modules/cjs/loader.js:892:18)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
at Function.Module._load (internal/modules/cjs/loader.js:724:14)
at Module.require (internal/modules/cjs/loader.js:849:19)
at require (internal/modules/cjs/helpers.js:74:18)
at Object.<anonymous> (.../foo.js:8:14)
at Module._compile (internal/modules/cjs/loader.js:956:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
at Module.load (internal/modules/cjs/loader.js:812:32)
Having a look at the browser compatibility page, private static methods should be supported since v12.
Why is that?

Answer 1

The table states that Private Static fields are supported, not methods.
In node 13.2.0 it's working under --harmony-private-methods flag
[class] implement static private methods was added in v8 7.9. That version of v8 was added to Node 13.2.0
Using the flag, in Node 12.13.0 you won't get a SyntaxError but a TypeError when trying to access the method
TypeError: Read of private field Foo from an object which did not contain the field
v8 issue: Fully implemented behind flag