No idea how 100K is possible, he must be getting a lot of steals and blocks on defense along with dominating on offense? Hope he reveals it soon.
Check this out tho..

These are screencaps of one of my games, im a shot creating-slasher, Ive been trying hard how to get more XP. Looking at these XP i drilled down to how much each is equal to.
So
Contact Dunks- 180
Floaters- 453
Strong Finishes- 190
Fast Break- 150
Free Throws- 112
50/50- 180
Deep Outlets- 110
Screens- 60
Perimeter- 330
Picks Dodged- 300
Poked Loose- 200
Assists- 150
Blocks- 350
Rebounds- 70
Dribble Drive- 200
Well Defended- 200
A normal offense possession for me, I do this...
Screen + Dribble Move + Strong Finish + Contact Dunk
60 + 200 + 190 + 180 = 630
So thats 630 XP per one offense possession, and that's if I do it perfectly, many times I get fouled though or I dont dunk and its a normal layup which isnt any extra XP.
Now look at if I did this...
Floater Shot
Screen + Dribble Move + Floater
60 + 200 + 453 = 713
That's 83 more XP per possession . Now imagine if I did nothing but Floaters in a game. Lets say I make 40 floaters in one game.
Using this same method, set a screen, get the ball, do a dribble move, drive in, floater. 713 x 40 = 28,520.
That's more XP than I got for this entire game!
Then add in rebounds and assists I'll get throughout the game. I almost get atleast 15 rebounds per game and 10 assists per game (depending on if teammates can hit)
so thats 70 x 15 = 1050.
150 x 10 = 1500
Add that in, and we're up to over 31k now.
Dodge some picks, play tight defense, get some steals, block some shots, etc and add in those XP.
It's not 100k, but its still a good amount of XP for a full game.
Idk if XP is different for each play style or what, but something I suggest to do and i'll be doing this too soon, Im trying to max out my relentless finisher and posterizer badges though so I still might attack the basketball more. But when thats done, to get more rep, no doubt i'll be doing floaters. Hope this helps