Author of the original post here. To start of I'd just like to clarify that I'm a student at the University and have no ties to any of the administration.
The goal of the post was not to try and take credit for the successes of alumni, I rather wrote it to highlight how some of our alumni have gone on to do great things. I decided to write it after an experience I had this summer while I was interning at a VC firm in NYC. While there, I met the managing partner for one of NYC's biggest VC firms (I'll leave it unnamed) who basically said: 'oh, you go to UIUC.... they've produced one famous tech entrepreneur (Marc Andreessen), maybe you can be the second'. That's a sentiment I saw echoed throughout my time there and through previous experiences (especially on the East Coast).
In terms of the helping alumni with their ventures after graduation, I'd argue that the school has actually done a lot to help founders through the resources and early-stage funding available (a lot of these have sprung up recently). It's hard to compare it to Stanford/MIT/Harvard which are based in thriving tech cities where alumni and VCs can hop by on campus whenever.
Update: I'd also love to know (from everyone that sees this) what programs other universities have done to help alumni after graduation. Just because UIUC hasn't already done this doesn't mean we (students and alumni) can't start it. Just take a look at the awesome stuff that alumni from Harvard do for their community (http://harvard.splashthat.com/). It's entirely alumni managed + organized.