I dont think it is good practice for a final table situation. In MTTs there are so many more chips in the tournament and chances for much bigger gaps and variance in chip difference that you just cant get when you play a SNG. futhermore your objective when you are playing a MTT and a SNG are totally different. When you are playing any tournament your first objective is to make the money. In a SNG your money isnt going to hit until you are 3 or 4 handed whereas when you are playing an MTT and at a final table everyone is already in the money. So the strategies are totally different. Of course you are going to always want to do the best you can and get as deep as you can its going to be many different strategies when it comes to how to play a final table. A sng is just nothing like a final table situation, A final table is where you can make the most of something you have worked long for... even weeks sometimes if you are running dry so they become much more conservative at times and pick their spots with a lot more accuracy then they would if they were just playing any SNG. There really isnt any practice you can get for a real final table situation, unfortuantely you are just going to have to keep playing until you get into those positions and take the practice and the moment for what its worth at that time.
I strongly disagree with the bolded statements.
Your goal when you enter a tournament is going to be based on the number of entrants and the payout structure of the tournament, but is generally either "make the money" or "win the tournament". A satellite is on one end of the spectrum where "make the money" is the entire point, whereas large MTTs with a top-heavy structure that favor "win the tournament" are on the other.
Flat payouts structures and small entrant count tourneys favor playing to make the money, as that acknowledges ICM and leads to sizeable ROI. Steep structures and large entrant counts favor playing to win the tournament because a huge portion of the prize pool lies in the top 3 spots. ICM has very little bearing on decision-making until you are already quite deep in the tournament and in the money (often this is on the FT even). If you play to make the money in this kind of tournament you will often be playing too tightly, especially around the bubble, and be unable to make a sizeable profit in them.
A 9 man SnG is a reasonable approximation to an MTT final table because of ICM. Literally all the money is in the top 3 spots of the 9 man; virtually all of the money is in the top 3 spots of the FT. ICM impacts your decision making in these two situations in a very similar way, regardless of the fact that people are already in the money in the MTT. The fact that chip stacks are different, blinds are different, etc. are all minutiae that change the spots you see somewhat, but that doesn't make the decisions you face totally dissimilar. As a model for getting final table practice the 9 player SnG is about the best you'll be able to find outside of playing in MTT's and actually making final tables.