That presentation says:
- Most websdr cover HF and VHF using sound cards
- Only 96 KHz band coverage
- Just like Softrock
- OK for HF but no good for VHF / UHF
The operative statement is only 96 KHz band coverage. This is fine on HF, since 96 KHz is a good chunk or all of many HF bands. But with increasing frequency, the bands tend to get bigger. For example here the 2m band goes from 144 to 148 MHz: that's 4,000 KHz wide. The 23cm band goes from 1240-1300 MHz: that's 60,000 kHz wide: enough to fit the entire HF spectrum!
So you can see the issue: with "most" web SDR implementations using a sound card SDR which has a receive bandwidth of only 96 KHz, only a very small fraction of any VHF band can be covered. It's not any problem of WebSDR per se, just the receivers that are sometimes used with it.
If you can find a WebSDR which covers your frequency of interest, and has enough sensitivity to receive the satellite you'd like to track, there's no particular reason it would not work.