it looks like a fairly ordinary way of encouraging development to be honest - he's just taken the standard early years programe across the board and put it all in one place (or that's what it looks like reading between the lines of the website). if you are getting slt, physio, ot and vi services th bones of the programme are already in place, you just do them more often. from reading his website he's doing nothing new, just talking about brain plasticity and the importance of regular daily (or more) therapy across the board.
he will fill the need for people who do not have access to the whole range of therapists, or who prefer a 'one stop shop' approach, rather than running several different programmes from several different therapists concurrently (or those who do not do the suggested activities daily or more frequently from current therapists). similar results can and are achieved using the standard nhs programmes run daily or more frequently. the only difference is, nhs therapsits can be variable and reluctant to tell parents to up the frequency of therapy to see more results (they tend to 'are you managing' rather than 'you need to do more' ptherwise parents complain 
. i do remember our physio being faintly horrified by the frequency and extension of exercises that i was putting dd through. she came round pretty quickly though. 
all kids benefit from having the absolute maximum amount of different experiences as early as possible. reducing their social or physical experiences will close down opportunities for development. the more you do, the better the chance of results.
snowdrop looks fine if you need one programme designed for you. but also look at brainwave or any of the more established programmes as well. check out cerebra, they usually have a good grip on what's about, too. and sometimes will give you grant money if you aren't able to access the nhs therapys or need help to work on a particular area. snowdrop looks like another version of the same - it's absolutely fine, but doesn't look particularly ground breaking or 'new'.
i'm prepared to be told otherwise though. it looks fine. do they offer grants? is it a charitable or not for profit foundation? or is he running it as a business? are local charities funding programmes for kids designed by snowdrop?