Starting from something shared on a face book feed I came across a claim that a disadvantage of preferential voting is that it disadvantages (reduces the chance of being elected) minor parties and independents. I've seen this on the website australianpolitics.com and votingsystemspreferentialandproportional

The claim is repeated on both sites as below

Disadvantages of the Preferential System

...

It promotes a two-party system to the detriment of minor parties and independents.

Is this correct, has it been studied?

Starting from something shared on a face book feed I came across a claim that a disadvantage of preferential voting is that it disadvantages (reduces the chance of being elected) minor parties and independents. I've seen this on the website australianpolitics.com and https://votingsystemspreferentialandproportional.weebly.com/preferential-pros-and-cons.html

The claim is repeated on both sites as below

Disadvantages of the Preferential System

...

It promotes a two-party system to the detriment of minor parties and independents.

Is this correct, has it been studied?