I think there are two effects at play right now that both feed on each other. One of them is mentioned in the article, there aren't many properties actually on

I think there are two effects at play right now that both feed on each other. One of them is mentioned in the article, there aren't many properties actually on the market at the moment so it doesn't take many transactions or many buyers with the resources to drive up prices. The other factor is that some people did very well during the lockdown. Overall yes a lot of people suffered, but if you had a well paid job that you could do from home, and didn't need to pay for a season ticket to go to work, buy lunch, haven't spent on a big holiday, haven't been out to the theatre or restaurants, then you may well have expanded your savings quite significantly. With the low number of houses on the market, there doesn't have to be huge numbers of people in that position for them to move house prices.