That opensignal report is not about coverage. 4G coverage in The Netherlands is 95%+, not 89% as per the report. When the various operators got their 4G license

That opensignal report is not about coverage. 4G coverage in The Netherlands is 95%+, not 89% as per the report. When the various operators got their 4G licenses they had to provide 95%+ coverage within a certain amount of years. Belgium has a 94.5% coverage as per last year. The report shows 85%. The reason is pretty simple, per the report: "OpenSignal's availability metric tracks the proportion of time users have access to a particular network." That's not coverage. Your source doesn't show what you think it does!