Yes, very much so. Starting in mid-March, 2020, global GRX peering traffic dropped considerably from their normal, seasonal averages, due to vast majority of the world staying home – in their home networks. For a while, mobile roaming dropped more than 90% as the world really went into lockdown in mid-March.
Digital Interconnect - GRX Peering Amsterdam

Mobile roaming has since recovered to more 'normal' levels.
William Dudley Head of Mobile Innovations & Evagelism,
Sinch