Perhaps it was too early to give updated sales figures for Labo. They didn't give official sales figures for Labo until after the Holidays either. As they said, it's being treated differently from the main Nintendo Switch lineup. 1 million isn't an unsuccessful product. Niche? Sure, but far from a failure.
The first time they provided sales figures for Labo was in the briefing for Q1 of fiscal year 2018. Combined shipments for the Variety Kit and Robot Kit had reached 1.39m units as far as I remember. The figure barely moved upwards during the rest of the fiscal year. Despite the release of the Vehicle Kit, Labo didn't manage to cross 2m in calendar year 2018, so combined shipments during Q2 and Q3 of the fiscal year were under 0.61m.
Considering that Nintendo's in-house development teams have the task to develop products that improve hardware sales, Labo has been unsuccessful and there's no way around it. The Labo series of games has been a failure because it couldn't meet its goal of bringing in new customers. Nintendo sugarcoats the shortcoming of Labo by pointing towards awards that were won, but they did forego to give Labo a holiday marketing push because they already knew that the money is much better spent on Super Mario Party, Pokémon: Let's Go and Super Smash Bros. Ultimate. Internally they had written off Labo long before the year 2018 had ended.
It's doubtful that they will make any more sales figures of Labo public, simply because Labo isn't going to hit a new sales milestone.