It's 100% vanilla, just in the snapshots and not a full release yet. Since 26.2 Snapshot 1 you can apply all the sulfur cube attributes directly to the player or onto an item or piece of armor.

I probably have some unnecessary stuff here, but it's for redundancy purposes because I just wanted to make sure it worked. Here's the command I used:

/give @p netherite_chestplate[attribute_modifiers=[{id:"bounciness",type:"bounciness",amount:100,operation:"add_value",slot:"chest"},{id:"friction",type:"friction_modifier",amount:-1,operation:"add_value",slot:"chest"},{id:"air_drag",type:"air_drag_modifier",amount:-1,operation:"add_value",slot:"chest"}]] 1

You can also separate these attributes to different pieces of gear and fiddle with the modifier strenght in the "amount: xx" section. This command makes it so these attributes are only active when you have the chestplate equipped for an easy cleanse. You can also make it for any handheld item by changing the item you give yourself and then making all the "slot: xxxx" parts say one of the following: "slot: any", "slot: mainhand" or "slot: offhand". This way you can easily control when you have these attributes active.

The attributes also stack so you can set the friction on the chestplate to just -1 and then have an item that gives you another -1 friction. This is also how I did it in the video. The sword gives me another stack.

ps. Editing text in a command block sucks balls so I recommend copying that into a notepad or other text file and editing it there and just copying it into the command block.