Welcome to the forum
Miss matched tyres (different make/mode) can be physically different circumferences. If this is true on the one yer looking to buy then it will put the transmission under more stress than normal, if the 4x4 parts are all still fitted. That puts additional stress on the vcu viscous coupling unit. That normally ends in a bad way if it starts to stiffen up too much too often. Ird or/and rear diff can then fail. Ird is intermediate reduction drive. Its a fixed ratio transfer box that splits power to the front wheels and rear prop.
Eye would find out if the vcu and prop shafts are fitted. If not then its running mondo mode: front wheel drive only. Miss matched tires isn't a problem on freelanders running 2 wheel drive but don't feel right driving on road in my opinion.
Eye would steer clear of a freelander running mismatched tires unless the seller drops the price to replace them... And theres no problems with the transmission.