To be fair, I don't think Covid-19 had disrupted Nintendo's marketing plans a month ago. The global situation has deteriorated rapidly in that one month. Nintendo clearly had a marketing strategy in place for January and February and they followed it. Given the Indies World broadcast last week and the Lego announcement this month, they're still continuing with announcements.
But we are at the point were the rest of Nintendo's 2020 plans are in doubt, absolutely, and that affects whatever general Direct they put out. Everything from Glastonbury to the Olympics to major movie releases are being pushed back by months or a full year. It'd be foolish not to expect that to hit the gaming industry. Nintendo might have summer releases delayed into autumn, for example, to help compensate for delays to products currently in development but which are further from release. They might decide to concentrate on digital content in the early summer while retailers are closed in many countries.
