For DVB audio is used only MP2 or AC3 in 2.0 or 5.1, some providers are testing AAC.
Are you talking about one specific country?
If not then AAC audio is in use, and has been for years, on DVB-T and DVB-T2 broadcasts in many European countries, and has long since ceased testing.
All Freeview HD channels (on-air since around 2009) in the UK are using AAC 2.0 or 5.1 - BBC One HD, BBC Two HD, ITV HD, C4 HD, C5 HD etc. on DVB-T2.
In Norway, AAC has been used since the launch of their digital platform. Similarly Ireland and New Zealand use AAC.
In most countries, MP2 audio is used for SD MPEG2 services on DVB-T that launched in the late 90s and early-to-mid 00s, with either MP2, AC3 (Dolby Digital), E-AC3 (Dolby Digital +) or AAC used for SD and HD services that use H264 or H265 video encoding that launched more recently.