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Yes, that's the conclusion, yes it's just a suggestion that will not guarantee an easy win, because all cannot be separated from luck. Maybe the person who suggested it because he just got a big win on that site so he suggested playing on the site that person mentioned, but this kind of thing does not guarantee to win.
Apart from luck, what you mentioned is the impact of gambling where your friend lost and blamed the other person who suggested the site. He should not blame others, because basically if he gambles, he must be ready to lose like the person above. The principle must be ready to lose and can limit gambling games so as not to fall deeper, because of course the bad effects of what you mentioned are already visible. So it can trigger disputes between friends that will become a small chaos in the friendship environment.
No knowledgable gambler will blame another person for their loses even though it be the friend that make refer them to the site, and if you lose it doesn't have anything to do with site unless for the few casinos who may have poor reputations and scammy character that will purposely set the game in a fraudulent way to place the house at 100% advantage only such casino will trick gamblers into lives just to take off their balance, casinos in that categories are the bad actors in the market today and we have to stay aways from them by all means.
But aside from that, if you gamble in a reputable casinos, what will stand between you and you victory will be just luck and little bit of skills.