firstly its impressive to hear of a small independent media outlet getting a prestigious opportunity like this in the days of the huge mediacorps normally taking over everything. and clearly you must have the blessings of Anfield to get all this kit into the stadium in the first place.
I can guess what is going on here - you've probably got an agreement with a PR/marketing person for the reporting.
They may even think you are a traditional radio station, and that remote audio is being sent the old way using a high power VHF or UHF analogue transmitter like a big radio microphone, or even just a GSM mobile telephone circuit or other point to point link and therefore your techies handle all the provision of this, whilst the laptop is used for basic web based comms without audio streaming.
This is still one way of doing it but more resource intensive, the kit and JFMG/Ofcom fees are not cheap, and someone has to sit at the office instead of Anfield and operate the mixer unless you've got automation on that as well (even then I wouldn't chance it for a footy match as the timings vary).
The Anfield ICT folk might be paranoid that if everything was left too loose, that hackers would get into the players' / managers private comms and perhaps understandably so, its already been proven the meedja will use illegal tactics if these are not mitigated against. Football players may be security-aware against "hard" physical threats but not always the "soft" risks..
all this can be sorted out with a bit of prior testing and maybe having a contact on hand at anfield who can deal with last minute tech issues. I would expect at least one of the ICT techs at a football stadium would be not just curious but supportive of what you are doing...