The rant seems to be typical of those who want something for nothing. It takes real money to maintain and develop games like Runescape. As a developer for 30 years, including working for some top publishers in the business world, I know how much money it takes. Such money is not spontaneously created--it must come from customers. So there must be a reason for them to pay for it--more features.
The point the original quote was trying to make is that if you considered F2P in its own right, it would make a very nice game. It is complete in itself, without the normal artificial boundaries. Most "Demos" have artificial boundaries. I believe several other on-line "free" versions have limits of 20 on the levels you can achieve. Many demos have a day limit or hour limit you can play. The fact that F2P Runescape has neither sets it apart. I played for nearly a year F2P and for hundreds of hours before I converted. The point is that F2P is a very nice and very playable subset of Runescape that you can play for a long time.
The likeness to an "expansion pack" is very appropriate. I have purchased dozens of games and their expansion packs. Most expansion packs provide extra units or capabilities, more quests (usually called scenarios), and more maps. That is exactly what the relationship of P2P is to F2P--about 10 or so more skills, about 3-5 times the map space, and hundreds more scenarios (I mean quests).
As for the Squeal of Fortune--you must understand that it (and Solomon's store) were added to separate customers from their money in a voluntary manner. Give them a teaser to get them hooked, and then allow them to buy additional items/capabilities. The ranter has swallowed the hook but refuses to be reeled in; if he will not accept that, then he does not deserve any additional items/capabilities.
There is an old, and apparently forgotten saying, "you get what you pay for." If you want more simply pay for more. If you don't like what is offered, then don't pay for it. You may complain that it is not enough. But do not be surprised if the seller does not want to provide more at the price you are willing to pay. If he cannot make a profit, he has no incentive to offer more. In your case, you are offering no money, so he has little incentive to offer you more content. Be satisfied with what he does give to you as F2P. That has been significant over the last few years, when you consider how much you have paid for it. If that is not enough, then pay for it and become P2P.