Pac-Man and Tetris are still my favourite all time games. Doom 2 is still my favourite FPS. Soulcalibur on the Dreamcast is still my favourite beat em up. System Shock 2 is still my favourite survival horror. All of these games were released > 20 years ago (30+ in some cases).
I still love good old 2D RPG. May be making 3D RPG is easier or cheaper so no one is making 2D anymore. But i still love 2D. Even in pixelated form. Good Old Zelda, Sword of Mana, Chrono Trigger
In fact even old Championship Manager ( now called Football manager ) was lots of fun. And Pro Evolution Soccer ( or Winning Eleven ) during Playstation Era.
Some of the fun part are lost in modern gaming. I reckon they introduce too much complexity and Real Life simulation into it. Or may be they care WAY too much about graphics, and not enough about Game play dynamics and Story telling ( Apart from Nintendo ).
I also find that if I want a quick blast to clear my head, then a five minute game of Defender, R-Type, or a round of Bomberman does the trick far better than contemporary so-called casual games, which for reasons I can't explain, often give me unpleasant mental sensations.
Then again I am a strange person. If something from the past was meaningful to me, then it is still the same when I revisit it. I sort of live in a "long present", accumulating things of meaning and only setting them down when I'm finally done with them, whatever the vagaries of fashion.
(As an aside, if the author of the article wants a better Amiga racing game that hasn't been ported to DOS, then check out Super Skidmarks. I used to carry my Amiga and TV set to my friends house to play this over a null modem link; its an amazing party game)
Contemporary as in "of that era" or "current times"?
If the latter, I'd have to argue this is because modern games have become very, very good at being blatantly addictive and shamelessly peddling in-game purchases that it becomes obvious the purpose of the game is not entertainment, but to engage your eyeballs.
That may be true for you, but I've played through games like Quake 1, SMB3, and Super Mario Land II this year. I love retro games and enjoy them more as an adult than when I was a kid. Plenty of us play retro games legitimately and not just as a 5 minute nostalgia hit. Modern games are not necessarily better or worse than older ones
Some game have proven timeless though. I'm currently hooked on Super Mario Bros. 35 and since it launched have been playing it exclusively. Mind you it does have a few quality of life improvements compared to the original, and the online competitive component makes it extremely fun.
Which is true for any artistic medium.