Test 1 usually is private if there's no new TV tech to test (F1's done full public tests sporadically over the years but hasn't consistently broadcast test 1 since 2008, leaving it to Sky or similarly-large broadcasters to decide whether the cost/benefit analysis is worthwhile. As a rule, in years where it happens, Sky is be footing the bill, not Liberty or its predecesor FOM).
I believe journalists with solid records of attendance in 2021 will be allowed to attend (meaning racefans.net, at least, will probably have its own angle on events due to having its own travelling journalist) but I may be wrong. It's not clear whether the track is bothering to open for spectators, or on what terms if so; with Sainz's star rising, Barcelona may decide it's worth the effort if COVID rules are compatible (as is likely).
The part that grinds my gears on this is the cynical re-labelling of the test. The regulations indicate it's still being treated as a test, so this is merely a re-branding exercise from Liberty.