Where did these statistics come from? A paywalled article published in The Times, "Tech firms blaze trail with huge jobs drive", cites a report by Tech Nation, "Jobs & Skills Report 2020", which analysed advertising for job vacancies in the UK, from June to August 2020, using data from Adzuna, an online search engine for job advertisements.

The Times article states, "In nine British cities, tech companies account for a fifth of all employment, including Glasgow, Edinburgh, Bristol and Reading. In Belfast and Cambridge, the sector employs 26 per cent of the workforce." What percentage of the workforce in Belfast is actually employed in jobs in the tech sector? Using BRES (Table 1.1 "DCA"), the two relevant industrial sectors (SIC Sections J 'Information and communication' and M 'Professional, scientific, and technical') are estimated to have employed 32,927 people in Belfast, or 14% of the city's workforce. This includes jobs that are very unlikely to match the Tech Nation report's meaning of "Digital Tech". (For example, section M includes lawyers, accountants and planners as well as engineering roles.) 

We reviewed the subcomponents (or divisions) of the two sectors (see Notes), and have calculated that an estimated 18,041 people are employed in IT and engineering jobs, like those advertised at Adzura. This represents 7.8% of Belfast jobs.
In Belfast, the digital sector employs 26 per cent of the workforce.
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In Belfast, the digital sector employs 26 per cent of the workforce.
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In Belfast, the digital sector employs 26 per cent of the workforce.
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