No, because you've been able to self host (or have somebody host them for you) vector tiles for a long time with very little effort, and yes that will somewhat offload processing to clients, and, more importantly allow many styling decisions to be made by the client (but not all).

Static or infrequently updated vector tiles can be generated from OSM data by a number of tools, but those most popular right now are https://github.com/systemed/tilemaker and https://github.com/onthegomap/planetiler

The actual -new- thing is that the work Paul has done for the OSMF allows on the fly (aka in minutes) updates of the vector tiles. This is important for OSM contributors as a feedback mechanism and the main reason the OSMF operates the current raster tile service.

What is currently a bit out in the open is which usage restrictions will apply to to using the vector tile service as, just as with the raster tile service, the intent is not to compete with or replace third party services and a vector tile service could potentially do that.

> Static or infrequently updated vector tiles can be generated from OSM data by a number of tools, but those most popular right now are https://github.com/systemed/tilemaker and https://github.com/onthegomap/planetiler

this is the first I've seen of these alternative tools compared to using Tippecanoe(https://github.com/felt/tippecanoe). Are they considered to be higher performance?