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Good question. It doesn't explicitly yet say 'Direct Express' cards on the IRS FAQ site, but here is what it does say:
People who aren't typically required to file a tax return
Social Security and Railroad Retirement recipients who are not typically required to file a tax return need to take no action. The IRS will use the information on the Form SSA-1099 and Form RRB-1099 to generate Economic Impact Payments of $1,200 to these individuals even if they did not file tax returns in 2018 or 2019. Recipients will receive these payments as a direct deposit or by paper check, just as they would normally receive their benefits. Social Security Disability Insurance (SSDI) recipients are also part of this group who don't need to take action.
The part of 'just as they normally receive their benefits' is the key line. Also they just announced that SSI recipients will get their benefits automatically, and this time they do explicitly say either in your bank account or onto your card, whichever way you receive it currently.
So putting those two together you have to assume SSDI recipients will get their stimulus checks directly deposited onto their current method of how they get benefits, by either card or account.
And the good news is we should 100% find out very soon, as SS, SSDI and RRB recipients are scheduled to get their stimulus checks direct deposited between April 17th and April 24th. So there should be 100% clarity just around the corner.
Hope that helps.