They are a market maker because they are the ones providing liquidity to you.
They are always ready to quote you a buy and sell price upon request. As a market maker, they provide immediacy (no need to search for a counterparty).
For retail FX traders, there is no such thing as your orders being “directed to an LP(s)”.
Your trading platform is always your principal, meaning they are your counterparty. Your orders are always executed with your trading platform. (Notice how I saw “trading platform” and not “forex broker” because they are not brokers…they are dealers.)
Retail traders are unable to access the interbank market because they do not have credit connections that are needed to trade directly with the LPs.
Some retail forex trading platforms use an algorithmic trading system(s), a computer program that makes markets to their customers and competes with their third-party LPs. Which is totally fine as long as pricing is similar to prevailing market rates AND your orders are executed at these prices quickly and with no (or positive) slippage.