Primary sources exist(ed?) on Chinese web, i.e. provincial gov websites advertising these "overseas service centres" used for diaphora services like renew PRC drivers license, which western western MSM regurgitating "Safeguard Defender" propaganda turn into overseas "police stations". Services also entail liasing with PRC law enforcement, i.e. if Chinese tourist gets robbed, they can refer to service centres for guidance, but it's largely PRC public security telling them how to work with local authorities due to language barrier (see drama of Italian police patrolled with Chinese police). These setups exist because PRC tourists/diasphora everywhere now (and thus targetted everywhere), but most places haven't brought up Chinese competency in public services.
Except US, AFAIK no other gov investigating has publically released evidence of foul play. Like there's arguments to close these stations are extra territorial setups, except as far as I'm aware, they're run by diasophra citizens of countries, not Chinese nationals. And LBH, anything pertaining to US actions vs China from last few years is indistinguishable from propaganda. There's some US court docs on the couple Chinese (US citizens) in NY being prosecuted for repressing dissidents on behalf of PRC gov, that's as close to primary source as you can get. This all without touching the founder of SafeGuard Defender, Peter Dahlin... history with PRC, first westerner to be charged for work undermining national security afer NGO reforms, arrested for a few weeks, deported, seperated from Chinese gf). Let's just say he's got bones to pick.
IMO accusations are borderline retarded, and unsurprisingly borderline retarded western msm and useful idiots in west believe it. Spend half a second thinking why PRC intelligence operations would coordinate under very public (and publically advertised) arrangements that gets comingled with civil activities. It's dumbest possible "front" to host these activities, especially for operation foxhunt tier work. Like Chinese spies, especially those with foreign citizenship,can get all sorts of cover work that doesn't directly linked back to official Chinese gov activities (as in terms of paperwork)... and they choose what, network of borderline extraterritorial consulate service arrangements?
E: The TLDR for me is western (really US led) propaganda associated with broad effort to dismantle PRC's United Front like work abroad, started with Chinese programs at various universities. Because again, Chinese intelligence so stupid and lazy (or bold) that they would setup in actual campuses. Which itself is response to PRC basically destroying US/Western NGO operations in PRC mid 2010s for subversive influence ops. Except Chinese don't really run large think tanks or well resourced NGOs as cover for their intelligence activities aboard. They don't need to, they have diasphora citizens everywhere already integrated. The few comparable arrangments that exist are United Front related setups in the west.